I would always expect any days pre-Christmas (or even on Christmas Day) to be better crowd-wise than the dates after it. As I've always said, as soon as Christmas ends, people have gift money to spend, time off of work and school that they may not have had before Christmas, not to mention they are suddenly free from family obligations, and they flock to DLR en masse. If you can swing it, I would go for the day prior to Christmas - or even on Christmas Day - rather than after. How magical to be in DLR on Christmas Day or Christmas Eve! I would love to do that, just to see if it's extra magical on the actual holiday (and it's hard to top the magic that's all over for the rest of the season)! But if it ends up being after Christmas, it will still be a wonderful day!
At least a few of the people over in our Disney at Christmas thread are planning to be at DLR over the actual holiday, and we've been trying to find out if there are any special meals served at any of the restaurants just for Christmas Eve and Christmas Day. We have a lot of views of that thread, so I'm guessing someone out there lurking must have the answer!