My sister and I took our children almost two years ago for Thanksgiving week.
If you have been to Disney at the holidays, expect nothing like it at SW. In fact, my sister and I were amazed at how dead it was, especially on Thanksgiving day. The Christmas shows started on that Friday night. That was busy, but not unmanageable. SW really does the holiday shows well...it is not to be missed, especially the puppet nativity show. Barbershop singers are great, ice skating, kids loved the Polar Express (I hated the motion), Sea of Trees and decorations are incredible...and, it takes a lot to impress me. IJS.
We left on Saturday afternoon.
We have also been at SW many times for Christmas, again nothing compared to Disney. And, Thanksgiving was much less crowded compared to SW at Christmas/New Years.
I highly recommended it at any time. Now, last December I thought the food quality had really gone down (was much better at BGT), but we still did the all day dining most days. The water bottles and fresh fruit breaks were worth the price alone.