Hi there, Kimberly!
Disney Parks does have a wonderful web site, and the
Walt Disney World Resort site is incredible in describing the "world" of excitement awaiting you. The best place to do your planning is found right on the Walt Disney World site: just click on the 'My Disney Vacation' tab at the top (featuring the suitcase icon), and you'll be brought to a feature-rich planning toolbox that will become your ultimate itinerary dashboard.
But it is true that not all of the restaurants are listed in a single place on the Disney sites.
One great resource is the information found about the
Disney Dining Plans. These .pdfs list each and every restaurant at the Parks and Resort hotels, and, in some cases, give a quick sketch of the fare.
In actuality, though, many of the third-party fan sites become your best resources. Bear in mind that while reliable and updates frequently, these are not affiliated with Walt Disney World in any way.
The best of the bunch that I have found is AllEars.Net. On this site, you'll find restaurants broken down by Park and by Resort hotel, You'll find a menu - or multiple menus for those restaurants serving at multiple mealtimes - and usually a price point per item, too. The site owners work diligently to update the menus as Disney makes changes, and the updates are highlighted for your browsing convenience.
If you have some specific questions, you are welcome to drop me a line at any time.
Have a wonderful trip!
See you later, celebrator,
-Deborah B.