Guys, don't worry about not visiting before application submission. yes, your essays are richer, but if you do your homework, you'll be fine. Read every word of the web site, talk to current students or alums, etc.
I didn't visit until after I had submitted, and look at me now......(tongue firmly in cheek)
Sometimes visits are more about yield management than part of the actual application.
And search for a post by lhotseface - he had good advice for personalizing your app. He probably posted it sometime in December (or maybe Nov) of 2006....aeons ago.