I think you're picking a great time to go. . .weather should be highs of about 80, lows in the sixties. Crowds should be minimal, esp if you're going outside Thanksgiving week. Have fun, pack a sweatshirt or a sweater for the evenings.
A great time to go. Temps should be 60's at night to upper 70's, low 80's during the day. I'll be at the Grande Vista the first week of December as Disney has their annual Christmas party experience the first week in Dec if your stay extends to then. It is always a fun time.