I guess going back to what Greg Cox pointed out it's probably more important for you guys as the writers to try to imagine the settings as you're writing. I would guess you are playing the scenes out in your mind as you're writing and it's probably helpful to have an image in your head of where the scenes are taking place just so you can move the narrative along in a coherent manner, even if that doesn't end up in the book itself exactly as you're thinking it.
As I said, that's often a problem for me -- if it's a dialogue scene, I tend to just focus on the characters and forget to visualize the scene. Or if I have a setting in mind, I sometimes forget that I haven't described it on the page.