I hardly ever think in words. It's all abstract concepts in my head. They're too difficult to translate into words a lot--but I don't try to explain the most abstract ideas to other people, so it doesn't bother me.
And really I find it's not the way my thoughts present themselves that's hard to deal with, but the speed. When I'm moderately focused, comprehension of multiple things will hit me at once, snap snap snap, and I'll jump from point A to point K without remembering anything inbetween. (Sucks on tests that require an explanation of how you got your answer--look, it was intuitive, can't I just leave it at that?)
And then other times, my thoughts stall and I'm pretty much thinking of nothing. Drives people crazy. I'm spacing out looking at a brick in the wall, no, I'm not necessarily pondering the meaning of life, stop asking me what I'm thinking--I wouldn't tell you even if I was.
Re-railing my post. . .
I have a pretty small verbal vocabulary. That's not to say I don't understand when "harder" words are used, I just don't a: think to use them or b: feel like using them. (It's not worth the blank "huh?" look I'd get from most my friends, though I've heard that's fun to cause.)
Really a lot of my communication relies on onomatopoeia and visual things (hand gestures, sketches). But for some reason, people usually get what I'm trying to say without a lot of hassle anyway. . .