I believe there are some tables towards the back of the restaurant that have traditional chairs instead of the bench-style seating. It looks like some are still "in" the car, but face sideways, and others are designed to look like picnic tables. I found some photos on TripAdvisor, so maybe you could take a look and see if that works for you! I also noticed some photos of some Pooh-sized people sitting in the normal seating area, so you might be ok with the regular seating, too.
DH is a bigger guy (think linebacker, not QB! haha) and we ate there with no problems, but I do seem to remember thinking that the bench seat up wasn't terribly comfortable for anyone, regardless of their size (mostly because you can't adjust how close you are to the table). The food was pretty good, though, and it was a nice break from the parks!