I love going to Cape May! They provide you with an allergen list for the buffet and you can request GF Mickey waffles through your waiter. Also ask your waiter if they have anything else because sometimes they have GF donuts or muffins or breads in the back too.
They give you a little allergen list/menu and ask if you also need to see a chef. I said no. When the waited came, he was a little curt, but they were busy. I asked if I could get some GF waffles and he said ok. He seemed annoyed. I was able to eat safely, but don't expect to be treated kindly here. Honestly, I've only ever been treated nicely one time at any Disney buffet. I think the general consensus is, if you have an allergy why did you come to a buffet. Point taken. You could probably do much better at the quick service at the hotel, unless your kids want to see Mickey and Donald.