Well, I went through the horrible waiting last year. It was bad, because we all exprected a lot of movement, and every day was more disappointing than the previous. Indeed, I've heard from someone in the school's administration (not admissions, but closer than me anyway), that they usually pull 40+ students from the waitlist (for a total of 185 matriculants on average; I guess not too bad). Last year, however, only a couple of people got off the list, and I think they were special cases. Apparently, many other schools had a similar lack of waitlist movement. I guess that last year, everyone got in exactly where they wanted to go. I think it was bad luck for all of us. I suspect this year will be much better for waitlistees, especially considering the AMCAS fiasco.
Good luck, and hope the long wait isn't.