Hi, my family was there last May, on Memorial Day, and it was not full. We did have priority seating, but it wasn't necessary. The only drawback was they did not have enough wait staff. Hopefully, that's changed by now.
We had breakfast there on a Saturday morning around 9:00 in December and were seated immediately.
The funny thing that happened was that as we got up to leave, I heard someone call my name. I turned around and it was a guy who works as a computer tech in my office! We didn't even know each other was going to Disney, turns out we were both staying at Boardwalk and just happened to be leaving the restaurant at the same time!