When I write my scripts, there's a point at which if I'm not starting to see them visually, I feel like I'm kind of cheating. So my scripts are laden with a lot of visual description, which makes them not so much fun to read - I kind of weigh them down.
It's very funny because every time I make a movie, and I've heard this re-echoed by other filmmakers and actors I have worked with, you kind of feel like you're naked again. You have to figure it all out from scratch, as if you had never done it before.