The week between Christmas and New Year's is one of the busiest of the year, but it is so magical that it doesn't matter to me! They do tend to have longer park hours than normal "winter" hours due to the crowds. As long as you go with the right attitude and enjoy it for what it is worth...you will be fine! After all you will be spending Christmas at WDW!!! What could be better than that?!?! Have a wonderful trip! By the way....if you plan on being at the MK on Christmas Eve or Christmas Day, get there EARLY!