In 07 we did Disney EARLY December. We drive, left the Sat. after Thanksgiving, first day at parks was Sunday. It was nice and slow at that time, the whole week was great, it only got busy on the weekend. '09 we went the second week of Dec (everyone always said the second week is best). We were there the 5th - 12th. It was awful in comparison. It was so busy, just walking around was a pain. Yes I do know it's certainly nothing like an official "high" time. We were lucky that we have little ones so we didn't have a need to wait hours for major rides. We met several people that overlapped into our time, they had been there that previous week, and they said it had gotten so busy. So I recommend sticking with RIGHT after Thanksgiving crowds... arrive to be at a park the Sunday after thanksgiving at the earliest, and spend that next week there.