I'd like to know the averages on these dates as well. We're trying to convince my mom to take a long overdue trip with us next year. (Trust me, it's going to take that long to "work" on her!)
I hope the crowds are low since we'll be there the same time! I've been during real slow times, and I think that early December will have alot more people, but not nearly like a peak time.
I've gone the first or second week of December the past 6 years and crowds are on the low side. The one exception I noticed was MK on a weekday when there is no MVMCP and Spectro is scheduled for that evening. Many people pick that day for their "MK Day".