Christmas is such a magical time. Even though it's crowded, and if you're not at the parks at opening in the mornings, it can take forever to get some attractions done. We waited only 15 minutes for Mission Space one time, but over two HOURS (sign said 65 minutes) when we arrived later in the am.
That said, my brothers family and I had an extremely wonderful Christmas stay in a house at Windsor Palms. And it only took us 15 minutes from MK turnstiles to driveway using Sherberth Rd.
I do recommend signing up for TourguideMike to help plan park strategies. Even as a saesoned WDW visitor, his comments were on target and helpful.
We were able to get PS for CRT, Candlelight Processional with dinner at Le Cellier, and even an IllumiNations Cruise--planning makes perfect!
hth