Robin, what do you do when life hands you a lemon? Me? Personally, I give it back because I don't like lemons. They're too sour for my discerning tastebuds. However, the correct answer is "make lemonade!" So let's help you do just that under the pretense that you actually enjoy lemons.
Granted, the parks will be crowded at Christmastime, and with a crowd level of 10, it's about as packed as it can get. The best way to minimize your time waiting for attractions is by coming up with a touring plan ahead of time and following it as logically as you can. You'll have much more luck dealing with crowd levels and attraction wait times by following a touring plan on a crowded day than going into the parks unprepared on a less crowded day.
At Christmastime, since the parks are usually packed, Disney will increase the operating hours of the parks to help accommodate the crowds. That means you can get there early and stay late. Arrive before a park opens and hit some of the most popular attractions first. Around midday when the crowd levels peak, head back to your resort and take a nap. Then, return to the parks in the early evening and take in some more entertainment and attractions.
Let us know if you need help with any of the particulars!