We went Thanksgiving week as a last minute trip and I thought the crowds were not bad. I hear that weekend is pretty crowded though. I wouldn't spend Thanksgiving day at MK- we went to Epcot. Make sure you set up some PS early - they were hard to get at the last minute and Thanksgiving dinner goes quick. I had fears that we would be eating hot dogs on a bench somewhere. Ten days should give you plenty of time to relax, take your time and return to things that were too crowded at an earlier time. Wish I could go for that long!