Pretty much the same for me. I learned two when I learned to type and two it is likely always to be.
What kind of terrible typists were you up against that you could beat them in accuracy and speed? I guess I could see this happening if you were supposed to be learning touch-typing, and they were all at least trying to type without looking at the keyboard while you stared and it and picked out the right keys. But as soon as they actually learned the layout and got comfortable with it, they’d blow right by you.
The extra spaces litter a document with white spots which are distracting to readers rather than helpful.
The spacing doesn’t change the implied meaning, either way you need to delve the meaning through context. Why do you think it does?
Grade 11 students, so that would have been…2003? It was a general computing class teaching you all the Microsoft Office software, some basic layout stuff in InDesign, basically Computer Stuff Your Employer Would Want You To Know. We were expected to already know how to type properly. Not secretary style typing, of course those people would blow me away.
I should set up a webcam to watch how I type sometime.
I illustrated the potential two differences in post 10. But I find that debatable and isn’t something anyone actually looks for. Despite the passion people have on this topic, in reality readers don’t give a damn and don’t use spaces to determine anything more than individual words.
Hah! Yeah, that’s a bit of an error there.
I think 2 makes much more sense since the extra white space sets each sentence apart. Just by glancing at a paragraph and paying attention to the white space you can see if there are lots of short or long sentences. Of course if there is a lot of other punctuation like hyphens and semi colons, then the extra space is harder to detect on a quick scan.
I was taught to use 2 but I never considered it as having been drilled into me since it always made sense on an intuitive level. But I do have a bias in favor of crisp, open formatting. I write in block paragraphs that are single spaced with no indentations. These are separated by a double space.
I think intelligent use of white space is important and you are unnecessarily throwing out valuable information about writing structure by forcing a single space between sentences. I will always use a double space. The style guides can eat my shorts.
How is it valuable?
One if I’m on a computer, two if I’m on a typewriter.
You can see at a glance how many long and short sentences there are. I can’t quantify it, but I think that helps prepares your brain to read the paragraph. You read a sentence differently (I do anyway) depending upon my expectations.
I’ve never really thought about this consciously before - meaning I’ve never explicitly analyzed how I approach a piece of text - so maybe I’m not doing a very good job of explaining what I mean. I’ll try to pay attention the next time I’m reading something formatted like a normal novel. I read a lot of magazines and in that context I don’t think it is as valuable since they tend to break the formatting up quite a bit - same with web pages.
I’m not reading the replies before posting.
It’s two.
It’s non-negotiable.
Two.
Two. Anything else looks cheap. As can be seen by comparing a pre1960 printed book with a modern one.
Plus I put spaces before ?. ! etc… As it was in the old days.
Yes really for me. 
I was taught that there are two sentences between sentences. I am typing two spaces between each of the sentences in this post. I expect that only one space will appear once you see it, and that will bug the crap out of me.
I read post ten. I still don’t see how it’s anything other than how you personally interpret it. Is there a style cite that says that the spacing is supposed to guide readers’ understanding of what is meant? If a person understands that ejaculate is another word for “said” there really shouldn’t be any confusion because you can scream and yell a bit of dialogue, but not smile or cum one.
Everyone picking two (excepting on old-style typewriters) is just flat out wrong, no matter what you were taught to do. There is zero support for using two spaces from any style guide or professional editor. It’s amazing how hard it is for some people to realize that they might have been taught something that is no longer correct.
It’s as boneheaded as insisting “marriage can be only be between a man and woman,” as if two of the same gender getting married somehow ruins the point of getting married.
Move on, people! There is no rational basis for two. Check some links above for evidence that double-spacing after periods actually slows the reader down.
Well, there wouldn’t be any confusion anyway, because realistically, nobody uses ejaculate as a synonym for shouting any more except in period writing, and context would (hopefully) make it plainly obvious. But assuming the lack of context, and assuming two spaces was in any way useful, it would provide a distinction. Let me try to lay it out a bit more clearly:
Even in a two-space world, there is only one space after a quotation mark.
“Holmes,” I said.
If a question mark or exclamation point is used instead of a period, it is not typically turned into a comma as periods are.
“Holmes!” I said.
Therefore one space would indicate that the quotation and the words following it are linked.
“Holmes!” I ejaculated.
It is possible to not add a speaking tag onto a quotation.
“Help me up.” I grabbed his hand and stood up.
In a two-space world, these are separate sentences and so two spaces should be used. Therefore, if I ejaculated is not a speaking tag, it is disconnected from the quotation and so there should be two spaces.
“Holmes!” I ejaculated.
I’m just pontificating for the sake of pontificating now, though, as this is possibly the only construction in which two spaces would in fact be useful and there’s no real point in writing a dissertation on it. I’m going to go ejaculate somewhere else now.
One space. I’d never come across the concept of two spaces until I saw it mentioned on this Board.
I use two. Y’all are just gonna have to learn to live with that.
When I think it’s likely that things I write are going to go through that many layers I’ll pay more attention. Right now, they do not so I don’t particularly care. And I’ve never read something and thought: ugh there’s so much ungainly whitespace in this document because the typist used two spaces instead of one, ugh. The only thing that pisses me off is when I see a word s t r e t c h e d across a line of text in a newspaper. Now that makes me have to slow down and focus on the sentence.