I think in pictures. In fact, I notice that it takes a lot of cognitive resources to think in terms of language. I started talking very late, but learned to read very quickly. Even to this day, I generally don't sound out words in my head when I'm reading them, instead processing the information visually.
The upside is that I process info pretty quickly. When I'm asked a question, I start seeing pictures in my head, and can make connections and come to conclusions based upon these images (helps a lot in trivia contests). Likewise, it helps with my sense of direction, because I keep a mental map in my head.
The downside is that it's going to take me several stabs at doing something if you give me text without accompanying photos, or instruct via speech. I'll often respond to these commands to the effect of "I don't know what that's supposed to look like", even when it's been demonstrated. The difference is that, of course, I know what it looks like objectively, but have no clue how it looks subjectively. This can be very frustrating.
Anyone else like this?