We were there last Thanksgiving week from the Tues before to the Tues after. It was our first visit during that time of year and our first over a holiday. The crowds were not as bad as I expected. Pretty similar to our June trips. So to us, totally manageable. We spent Wed in DHS and it was probably the most crowded we experienced of the week. Everything had longer wait times, but the rides there are also less numerous. With FP's and constant checking we did get on all the big rides, including TOT and Star Tours more than once. We spent Thanksgiving at Epcot. The only thing for Thanksgiving itself is that a lot of the restaurants do have a turkey dinner on the menu, so no need to skip out on that part of the holiday. For that time of the year, all the parks and resorts are decorated for Christmas and it's pretty cool. Epcot starts there holiday stuff on black Friday. The Candlelight show is excellent and the Holiday Illuminations is pretty amazing. We don't generally spend much time even exploring the resort we are staying at, but for that week we did make a point to set a side some time just to walk through the MK and Epcot resorts to see everything decked out for the holidays.
As for weather, last year it couldn't have been better if I had ordered the temperatures myself. It was high 70's to low 80's in the day and low 70's to upper 60's in the evening. Where we live Thanksgiving is sometimes full out winter weather and it's not uncommon for us to have to shovel snow by that time of year. So to us it was heaven. Shorts during the day and a light jacket or hoodie in the evening. Swimming on Thanksgiving morning. I can't even recall if it even rained once? So I guess if it did, it wasn't much. Reports from others were that cold fronts can happen during late Nov/early Dec. So we prepared for that by also packing a few jeans and never needed more than our jackets in the evening. Though being from the Northern Great Lakes area we drove to the airport with winter jackets and gloves so we were prepared for extreme cold too. LOL
We traveled a few times in early fall when the kids were younger and changed to early summer once they hit middle school. This was supposed to be a special trip for their sixteenth birthday in December, but we has such a great time and loved the Christmas theme of everything that were going to do it again next year over Thanksgiving.
regards