Hi, Carrie!
I sincerely believe that Walt Disney World is the best place in the world to dine when you have a special dietary need. From gluten-free to vegan, shellfish or tree nut allergy to lactose-intolerant, I have yet to see a dietary restriction that the chefs at Walt Disney World could not handle deliciously.
First, take a look at this post regarding
Special Dietary Requests at Walt Disney World. There, you'll see that Table Service restaurants throughout WDW are the best places to enjoy customized, gluten-free meals which are not only satisfying but are also delicious. However, there are also select Quick Service locations which can offer gluten-free options, too. I've found it best to ask at Guest Relations upon entering for suggestions for Quick Service locations which can more easily accommodate the particular dietary need we have in our party at that time. As menus change, so, too, do your options.
You should also take a look at the fantastic, unofficial site DisneyFoodBlog, which includes great posts on eating gluten-free while touring Walt Disney World.
Be sure to take advantage of the chefs' willingness to help with your husband's dietary needs at those Table Service locations, Carrie. They are so genuinely excited to help create an entire meal that every Guest can enjoy; you'll be so impressed with each and every bite!
Send more questions as you think of them, too; we love to help!