My father has the same thing. You should tell them when making ADRs. However even if you just show up or forgot to tell them tell your waiter and most likely the chef will come out. Even if achef does not come out theyb will tell what you can and can not eat.
Remeber even if the food itself is Gluten free it also has to be prepared in a way to prevent it from becoming contaminated with a gluten product. for example french fries should be fine, but if they are prepared in a fryilator that also cooked breaded fish then the fries will then contain Gluten from the remnants of the breaded fish.
When we went to the quick sercvice restaurant in Germany my father asked them and at the Time the Brats had no fillers so they were Gluten free. and since he was ordering his with no bun they gave him two brats (I think a brat is worth way more than a roll but that is another discussion)
Some soy sauce has wheat and some does not so even at China they were able to amke him a good meal.
Just makle sure you tell every restaurant and they will take good care of you
On a side note you should try cooking for my family, dad Celiac, mom Vegitarian, sister gave up Beef, me I kove it all. (although looking back my father went years being sick and not diagnosed, fianally collapsed dehydrated and 120lbs and made it to a doctor who figured it out. I am now seeing alot of the same symptoms in a very minor way) Celiac is thought to be one of the biggest herditary diseases of people with a British backround.
When we were at the Tusker House breakfast a few weeks ago, I noticed the family next to us was not getting up to charge the buffet. Then a chef came out an introduced himself and said, "So, we have a gluten allergy." Then, he gave them a tour of the buffet to point out what they could eat that was gluten-free. I thought that was neat they do that. 
They are one of the few character breakfast that tried to give frozen gluten free waffles. Ohana, Cape May have always made fresh Mickey waffles for DD. 
