I think there are a couple of good blogs like gf/df in orlando,etc. just google gf disney dining- that said, personally, one my treats I love at DHS is the gf allergy chicken tenders(and the fries)...the place near Star Tours... I NEVER eat these things at home,EVER. But at DHS they are so good! Many qs places now have a wonderful premade allergy menu to pick from,just ask when you arrive.
At Epcot,oh my so many choices! one of my faves is the qs at Tangerine Cafe in Morocco- I order a chicken shawarma platter without the bread.... and it is so good. Ditto the bakery area in France.... they have some YUMMY gf options there.....
remember just ask at the register for the allergy menu...easy to read for gf eating....