Yes, yes. Ditto for sweatshirts. I don’t want them so bulky that I feel like the Goodyear Tire mascot.
And I wish manufacturers would make shirts shorter. I’m short waisted and don’t appreciate shirts that hang below my ass.
LOL I have the opposite problem. I am 5’8" but wear petite length pants, and I always look like a fat loser wearing my short shirts 
The issue I seem to have is that thin t-shirt material tends to be more shapeless. I agree that thinner, softer t-shirts feel nicer to the touch. But they don’t seem to look as flattering on me.
Nor your waist either, which is another plus for thinner tees.
I much prefer the thinner shirts. The thick ones make me look like a shapeless block instead of a shapely Blob! Oh, and I hate pockets, too.
I like em heavy too. I wear mainly Carhartts as well, long sleeve when it’s really cold. They are the heaviest ones I’ve found. Duluth Trading longtails are pretty heavy but not quite as thick as the Carhartts.
I agree with the OP, and am about to google some of these store recommendations right now.
I hate the boxy, stiff feel of thicker shirts.
AMEN! Preach it!
Armani Exchange has high quality, thin tee shirts that lay just right and they offer some style.
Don’t be afraid that it is Armani. Their ‘Armani Exchange’ business is more mainstream. Look for sales, etc, if you find them pricey.
But a damn good tee that you can wear with jeans and sits just right is worth it to me.
I prefer thinner (but not tissue-thin) T-shirts. If they must be thick, as are many concert Ts or the kind of Ts you find at sci-fi/anime conventions, I prefer them to be soft and not too stiff. I have a Ramones T-shirt I would wear more often if it wasn’t so stiff and unyielding, even after years of washing and applications of fabric softener. Then again, I figure I’m not punk rock enough for that shirt. A true punk would probably wear that shirt no matter how uncomfortable, it seems to me. 
I wear printed t-shirts almost exclusively, and I hate the thinner cotton ones. They don’t seem very durable. As an undershirt I can see the utility of wearing a thin one, but when when I’m wearing just that shirt and nothing else (as a top, you pervs) I want something that’ll take more than a dozen washings. Yes I’m looking at YOU, woot.com!
In my experience, thinner t-shirts wear out faster. A lot faster. I have never noticed an appreciable difference in warmth, and I prefer not showing my chest or belly.
There’s one for the “appropriate username/post” file.
I had a heavy canvas shirt from Cabella’s that was so stiff it practically stood up by itself. I washed it and washed it to soften it up, to no avail. I was about to take it down to the river and beat it into submission with a rock…then I read, soak it overnight in a pail of water with a LOT of fabric softener, then wash. That did the trick. I would try that with a heavy t-shirt.
I admit, I’m a sucker for the new “layering tees” they’re pushing on women now. As someone said upthread, they flatter my curves more than the classic style straight cut thick t-shirt. They actually do make me look thinner, because they cling to my waist (the narrowest part of me) instead of ballooning from my bust to my hips.
Of course, within 2 years, they’ll start marketing “thicker, more luxurious” t-shirts again, and we’ll all be bitching that thin t-shirts are teh stoopid. It’s the nature of fashion - look how they took us from flares to skinny jeans, from crops to long tees…
Oh, sorry. To hide my chest.
This is true of Armani Exchange clothing, I bought a black wool sweater from them that looks identical to any other black wool sweater, but it’s amazing how perfectly it fits.
Ninja Boobs?
Sorry, I don’t know where I was going with that.
I think the thinner t-shirts are more comfortable, but for me they need to be looser fitting. My teddy-bear like physique has its advantages, but looking good in form-fitting outfits is not amongst them.
That said, most of my t-shirts that I wear I think tend to be of the thicker variety.
Can I swap you my worn out thin ones for some new thick ones? 
After using T Shirts for about a year, the constant washing gets them thinner and thinner until holes develop.
I get the standard Haines. I like them better than Fruit of the Loom. I only wear them as undershirts.
What I hate is the V Necks. The damn things slide around on my neck and get twisted up.
I always buy the crewneck.
Thick shirts suck. I do like most Carhartt t’s though, their fabric seems to be more coarse than thick.