WDW is the easiest vacation you can take with an allergy child. They know thier stuff. DS only has nuts, but was still dealing with his resolving egg allergy last trip so you have a few more things to deal with than we did. In general, Disney Owned places are safer than non disney, but we had great success at RFC too. As someone mentioned, let them know about the allergy first thing. At TS a chief has always came to our table, but at CS, you might have to ask some places. Some places and chiefs will go to more effort to create something special for your child, but all will do whatever to keep him safe. Our DS eats a lot of vanilla ice cream for dessert as they have a safe for him brand most everywhere. When DS was little I always carried some sort of dessert/treat as that is most often where issues arise for him. Most CS meals, we either skipped dessert for us, or took it to go and got him one of the Popsicle from the carts that was safe for him.