I realize I might as well have defined irony with that subject heading, but, ever onwards. I’m looking, especially, for a word that also alludes to someone who can explain things quickly, a combination, perhaps, of concise and precise. Turns out preconcise is not really gonna cut it.
-Birdmonster
Eloquent?
articulate?
How about ‘articulate’ or ‘fluent’ or the others I found here? I like ‘eloquent’ myself.
Both eloquent and articulate seem very very close. I just have an itch in my brain that says those aren’t quite what I was thinking of, which may not exist at all. Articulate definately gets the sense of using the most descriptive, apt words, but not necessarily the sense of brevity I had in mind. Am I being picky enough?
Look at the second definition of succinct. It means pretty much exactly what you described.
Erudite?
Can’t argue with that. I’m left with a strange disconnected feeling for no reason. Alas. Succint it is. Thanks.
Perhaps having perspicacity? Or being perspicacious?
Your Lisa Simpson quote just made it all okay. And, in a torrential downpour, working since 6 am, that’s a tall tall order.
loquacious?
I like to think “Exapno Mapcase” covers it pretty well. 
And the word of the day is breviloquent.