First of all, yes there is counter service at WL. But IMHO, it is not very good. We found the food to me mediocre, the place too small, dark and kinda smelly.
As far as ADRs .. you are going in Jan: it's not the busiest time. If you don't mind waiting and/or dining at odd hours, you would probably be ok except at the most popular places like Le Cellier and character meals. But if it were me, I would plan a few more. There is also the option of calling that day from your room before you leave for the park.
At that time of year, the parks close early, so actually dinners are easy to plan based on that. You know, for exaample, AK closes at 5, so on that day, make an ADR for 7 at the resort restaurant of your choice.