We will be there during that same week. We chose it specifically to avoid crowds! I can't say I've gone during that exact week, but I've been before at the end of Nov/beginning of Dec, & it was a lot different than when we normally go, in June! Less crowds, walk on some rides, a bit chillier. I look forward to it! The only drawback for some would be the shorter hours during the weekdays, but it looks like most of your visit will be during the weekdays anyway, and since your group includes a lot of littles, that should work just fine! The weekend (starting Friday the 21st) will be normal hours-staying open later, as well as including featuring the Fantasmic show! I'm going by last years calendar during this time-the current one was up to the 15th as of yesterday. It looks like the park will close @ 8p each weeknight.
How many little ones will you have? Our party is all adults-well, in age only-were all kids at heart! There's me & my DH , grown DD, her boyfriend, & our 19 yr old son. We are all so excited, and can't wait to enjoy the holidays!
I think we will be just fine, enjoy your trip!