I cant even imagine the crowds at Christmas time, but let me just say that I thought the MLK crowds this year to be HORRIBLE!!!! We picked MLK this past January becaused the kids missed some school during our October trip to WDW. Our school had a long weekend over MLK and I thought we could go then and miss 2 days less of school. We go every January and are used to NO crowds. I thought it would get crowded sat and sun. and start to thin out on Monday. Well, I didnt see any crowd thinning until Wednesday, and we left on Friday... So we had 2 days of no crowds or lines. I will never ever go again over MLK weekend. There was so much we didnt get to do or see due to the crowds. My DH wanted to come home on Friday ( booo booo booo) so we didnt have that 2nd weekend like we usually do. Even using the fast passes didnt work that great. The return times were sometimes 3 hours later, and we'd be on the complete other side of the park from where the ride was. If you can, avoid MLK weekend. After the crowds at Christmas, you will be glad you did. We love going in January!!! Just not MLK weekend!