Sorry it's taken me so long to get back to this thread - been a CRAZY busy week.
I had extreme exhaustion, which did not get better until I cut out dairy as well as gluten, but that was just my experience. My daughter had fatigue which did get better after she stopped eating gluten.
As for the experience with dietary restriction services at WDW, here is my two cents on that:
I have been to WDW four times since I was diagnosed with celiac and started eating gluten-free. Here are my experiences during those trips:
The chef came out at Chef Mickey's and walked the buffet with me, explaining what I could and could not eat. He also personally delivered a flourless chocolate cake for dessert that was to die for (this was before I began eating dairy free, so that's probably not an option for me now, but it was really good then).
The chef at California Grill called me before I left home and asked if I had any special requests. I asked for a flatbread with a gluten-free crust, which he said he would do his best to produce. When we got there, I informed the server that I had spoken with the chef earlier, he went and told him we were there, and he came to our table to see if we had any questions about modifications that could be made to any main entrees. After we made our decisions concerning the main course, he brought us the BEST flatbread appetizer I ever had in my life - it was totally scrumptious. Then he came back after our entrees to see if we wanted dessert. I was totally stuffed and declined, but my daughter did want dessert so he discussed with her what options he could offer and made her what she said was an awesome dessert.
The chef at Flying Fish came out to ask if I had any special requests. I asked for a gluten-free crab cake, which he was more than willing to make. He came back after about 20 minutes to apologize for the delay, explaining that he had to make the sauces that go with the crab cake from scratch because the regular ones had gluten in them. I was okay with the delay (I expect it to take longer to get gluten-free food because they have to start from scratch and keep everything separated from other foods being prepared at the same time), and when the crab cake did come out, it was better than the regular crab cake they serve there. My husband tasted it and said he was ordering that next time (and he doesn't have celiac) - it was that good! The chef then came back after we received our entrees to make sure everything was okay and we were happy with our meals (and boy, were we).
At the luau at the Polynesian, I received a phone call in my room the day before our reservation to discuss the dietary restrictions my DD and I had and what our meals would consist of. We had a TON of food, all of which was delicious, and the server was very attentive - he even made sure we had gluten-free rolls.
At Marrakesh, I asked the server for a gluten-free menu and he brought one for me. My DD and I ordered from that menu and had a wonderful lunch. I asked for and received gluten-free rolls there, also.
At Turf Club (where I have eaten several times), the chef always comes out and discusses the menu choices. He also offers whatever new gluten-free products they have available since the last time I was there. The last meal I had there was a gluten-free pasta and shrimp dish that was outstanding.
At Artist Palette (the counter service restaurant at Saratoga Springs), the chef always comes out and we discuss what meal options are available that day. They have made some really great counter service meals for me there.
At Cosmic Ray's and Pecos Bill's, the manager came out and took our orders personally to ensure they were prepared correctly. This takes longer than ordering the regular way, but it is totally worth it.
The only restaurant where I had a less than stellar experience was at Coral Reef. The chef did come out to talk with me, but he made it clear that he had better things to do than discuss my dietary issues. We had other problems with this meal having to do with the service and won't be returning, so this does not bother me overmuch now.
My suggestion would be that you tell the server when you are seated that you have dietary restrictions, just in case it is not noted on your ADR for some reason. If the server does not offer to have the chef come out to speak to you, just tell him/her that you need to speak with the chef. I have never had a chef refuse to talk with me when I requested it.
Sorry for the long post, but just wanted to share what my experience has been. Let us know how it goes!