We were down there this last December from Dec 1-7 and it was great! The weather was nice, cold at night (it did rain one day but we went to AK which was empty and great!) and the crowds were minmal. One day we acually rode RnR coaster 6 times in a row with about a 5-10 minute wait each time. MK was of course, the most crowded, which it always is, but it was manageable. All in all it was a great week to go and much less crowded than the week we went two years before which was 12/5-12/12! The only real crowds were at the Osbourne lights, and DD for some reason (maybe all the X-mas shopping). If you want a real treat, take the shuttle or your car over to Universal. We went to IOA and it was practically empty!