I think in words. There is always an internal dialogue. Even when doing music, or painting, I'm always anticipating what's next by some words; here comes the bridge, goes to Am now, gonna paint leaves in this shape, or maybe this other. I can visualize things and sounds, but words are always involved. That's probably why I'm not very talented at music or painting.
The thing is: I'm fairly confident my subconsciousness is the actual thinking part and my consciousness is kinda dumb if that makes sense. The part of my brain that does think in words is pretty slow and gets a lot of information from the "processor" behind without actually realizing it.
I visualize it as the 2 man start up where there one tech guy and one who sells it outwards.
