I have been going to DisneyWorld around Xmas time since roughly 1996 but I haven't been there during the times that you are looking at. I have done July, August, May, and April. I have a co-worker who went during the last week of October. He really enjoyed the trip; didn't make any mention of long lines or bad weather. He really enjoyed the halloween activities (Mickey's Very Scary Halloween). Whenever I stop taking classes, I will have to go to DisneyWorld during the last week of October at some point in the future. It sounds like fun! I haven't heard as many comments on Thanksgiving but New Years Day, as I'm sure you know, is very busy. I had reservations through New Years Day last year but had to leave a few days early. I can verify that things get very busy during the week between Xmas and New Years Day. Personnally, I prefer a quieter time but I do like the decorations and festive atmosphere.