I have multiple food allergies and have only had a problem at disney once!!!
They are great, and I always make one ADR a day and I always have the chef bringing out my meal, sometimes things that aren't even on the menu. My special meal usually gets comments from other diners, asking what I am eating and where it was on the menu! My favorites are Prime Time, Boma's and the food court at Pop Century! When I stayed at AKL Boma's (and the Mara) made me amazing meals (thank you chef TJ)! Pop (not my favorite resort but I go there for the chefs) always comes up with something amazing (props to chef Michael, Kristen and Mitch!) anf Prime Time made me fried chicken which I haven't been able to have in years! (thank you chef Richard!!!)