We've been three times Thanksgiving week and are returning this year. The crowds aren't that bad Monday- Wednesday- get your main stuff done here. Thursday and I've heard Friday are crazy at MK. We did MGM Friday this year and it wasn't that bad. I'll say that this year had the biggest crowds we've seen during this week. It was managable with FastPass, EE, and strategy. Just be prepared. I hope next year won't be as bad as this one- but if so we'll just plan accordingly. We did EE a couple of days and park hopped away from that park later- much better crowds.
It has always been perfect weather for us- 1 day of a 30 minute shower in three trips. We've always worn shorts with a light jacket for mornings and evenings.
The Christmas decorations are up and beautiful this week also.