I was at Epcot on the 11th, and Magic Kindgom yesterday. Yes, it was pretty warm, but I LOVED it! If you are coming soon, bring sunscreen, I saw lots of sunburned people yesterday. It is supposed to be a little cooler in the next few days, but it is 82 today, so a little cooler translates to: in the high 70's. If you ask me, perfect weather.
I didn't think the crowds were that bad at Magic Kingdom, earlier in the day definitely not too crowded, most rides had wait times of 25 minutes or less. I certainly got to do everything I wanted. The parade was at 5:00, the Frozen "show" at the castle at 6:15, and the castle is "frosted" in snow! Very pretty. The park looks beautiful! It is all decked out for Christmas. They closed the park at 7:00 PM for Mickeys very merry christmas party, so got kicked out at 7:00 PM. That also happens tonight. I did not see the special Christmas Parade, so I am hoping next week you will get to see that one. I would avoid Magic Kingdom on Sat or Sun for sure, the park is just going to get busier.
If you are talking Thanksgiving week, go Monday or Tuesday, yes, it will be busy! and go early in the day!
Have fun!!!