Disneyfan, for all of the crowds that we encountered on Sat. 12/14, the crowds were pretty light on Sun. 12/15. I think most of the groups have competition through the week, are done by Saturday and get it as a "free day," and leave by Sunday. I saw many more players and cheerleaders on Saturday, some with medals, so I assume the competitions were over by then. Also, though it was especially easy to notice loud behavior on Saturday, I think you might get this at any time of year, and I would still highly recommend this time of year, just maybe avoid the parks (especially MGM) on Saturday when these groups are most visible. Unfortunately, loud behavior is much more visible than polite, quieter behavior, so the loud teenagers can overshadow the polite, quieter ones. It was pretty noticeable just on the one day.