What price class hotel were you thinking of staying at? Disney World has three different classes (deluxe, moderate and value). The nicer restaurants tend to be at the deluxe resorts like the Contemporary, Polynesian, etc. But pinpointing what type of resort will help in figuring out what restaurant might work best.
The problem with lot of the restaurants at Disney properties is that they are the "all you can eat" style buffets. They are really good, but the problem with them is that they are a waste for people like us, because we are not going to gorge ourselves on all sorts of different foods. Plus, they are pricey (usually about $35 to $40 per meal). There are, however, alternative restaurants in most of the hotels which serve a-la-carte items.
Disney World has a website that lets you explore the different restaurants they have, and you can sort by category.
http://disneyworld.disney.go.com/reservations/dining/
Here is another site that provides the menus for Disney restaurants:
http://allears.net/menu/menus.htm
One word of advice: If there is any particular restaurant that you want to eat at (either in one of the parks or in a resort hotel) I would start making your dining reservations NOW. The closer to your trip, the harder it will be to get a reservation. It is almost impossible to get a reservation at one of the nicer restaurants when you are there. So definitely book ahead. EPCOT has a lot of nice, fine dining restaurants in the World Showcase part of the park. Most of the other parks do not have fine dining. But the deluxe resorts do. You can make reservations for any of the restaurants online, or you can call 1-407-WDW-DINE.
What parks are you going to? Are you planning to do any fine (or non-fast food) dining in the parks? If so, I might be able to give you some tips on where to eat. A lot of the quick service restaurants in the parks are fast food, or offer very little options for people with particular diet needs, but not all.
For example, in the Magic Kingdom the Columbia Harbor House (across from the Haunted Mansion) has some healthy alternatives. They have a grilled salmon served with couscous and steamed broccoli.
http://disneyworld.disney.go.com/med...house-menu.pdf
Lately Disney has been making an effort to give their guests healthier food choices. You even see concession stands with fruit and vegetables. In the past it was all fast food and junk food.
Another tip: As far as I know, Disney lets you bring your own food and drink into the park (however, I don't think they'll let you bring a big, hard cooler in the parks).