I agree with Linda that it's all manageable. However, in terms of lightest crowds, I think the week before Thanksgiving week is probably the best now. December, as a whole, has gotten more crowded. All the Christmas stuff is up that week and the MVMCP is going on. The only thing you miss is the Candlelight Processional in Epcot which doesn't start until after Thanksgiving.
Chris, aka Strmchsr
INTERCOT Staff: Vacation Planning, Guests with Special Needs, and Weather Guru