I couldn't leave a comment either.
I've been there when it's crazy-crowded, too. Last year I attempted to leave Fantasmic early and do a run-through, but unfortunately, my friends don't move as fast as I, and we got stuck in those ear-to-ear crowds that make me want to freak out.
Funny, though...when I went a couple of years ago during Christmas week, I kept hitting it when it was practically empty. It was wonderful!