Christmas time is lovely in WDW> The resorts are all decked out, the parks all have a signature tree, and there are many holiday activities all over the World. Personally, I would look at the holiday activites and plan what I wanted to experience, and then find CS restaurants in those areas. I also would think about a few lunch ADR's to have on place if you are worried. You can cancel as you draw closer.
I booked my lunch in MK becasue I tend to get claustrophobic there when it is crowded, and I really want an escape without having to think about it. My family is not overly concerned, so for the rest of the trip we are winging lunch. Also, use mobile ordering. I have heard it cuts down CS wait times a lot.