Last year, we arrived the Saturday before Thanksgiving and left the Saturday after...It was great until Wednesday when the AK was pretty busy-but not unbearable. On the advice of a friend, we avoided the MK on Thanksgiving Day and had an awesome day at MGM. Do NOT miss the 3 PM parade at MGM...it was wonderful! While the park was busy, it was not gridlocked and we didn't have any problem doing everything we wanted to do. We went to see the Osbourne Lights that evening...it was a perfect day. We saved the day after Thanksgiving to go to Epcot to see all the countries decorated for Christmas. Remember that a lot of the Christmas decorations go up before Thanksgiving, even at the resorts, so you won't miss anything the week before...