DD12 has developed food allergies in the past six months. We were at WDW 30 days after her initial diagnosis and I had NO idea what to expect. I was prepared with information from Brenda Bennett and from online searching.
DD is allergic to soy, sesame, peanut, hazelnut and watermelon. Soy is in everything (it's like corn). Sesame is still not required to be on labels (it can be hidden in "natural flavoring" for example). We were very dependent on the chefs at the various table service restaurants AND on the ingredient binders at every counterservice location.
We ate at Boma, Crystal Palace, Akershus, Kona, 50s Prime Time, Marrakesh and Raglan Road. We had very good experiences with the chefs coming out to talk directly with dd12 (and not just dh and I---made her feel more normal than she had in the previous month) at all restaurants but Marrakesh and Raglan Road. At those two restaurants, just the server talked to us. That didn't make me feel very comfortable.
I was so impressed with Cosmic Ray's that we ate there twice. Both times the manager personally got freshly steamed carrots (they're tossed with a dressing containing sesame and soy) and stood over the rest of our food, watching it while holding the carrots, then carried the trays over to me. I almost cried the first time because I had been so stressed about the food issue.