As a bit of advice, I would actually advise trying to educate yourself as much on options for food rather than planning. This is a great way so that, when people get hungry, you can see what people are in the mood for. Plus, tell people options when you enter so they know what they are getting into.
MK will be burgers and fries. Since the Terrace is hit or miss, you can just go in knowing this. Having said that, the Hot Dogs at Casey's are great. Also, the snack foods can be wonderful (although much of that is nostalgia for us around here, I think). Dole Whips in Adventureland, Ice Cream or pastries along Main Street, etc. are all great candidates. If you have picky foodies, MK might be a great day to follow up with a resort meal. Between California Grill, 'Ohana, Artists' Pointe, or Kona Cafe (my personal favorites), you have some excellent options just off park site plust a chance to do some exploring for first timers.
Epcot is great for people in this boat. My sister and I were picky eaters as kids, but with completely opposite tastes. Therefore, my parents instituted an Epcot policy of sorts. We always did Epcot over one and a half days. The half day would have the Land. It has now gotten even more upscale and almost progressive in dining. I really like it. Again, picky foodies will be pleasantly surprised. Picky eaters may not. As for WS, we would stop by every country. There are small stalls almost everywhere, so people could pick and choose. We started with one piece of something and, if people wanted more, we went back. This way, it became a little bit of food from everywhere, and no one went away disappointed because they didn't like their food (they just had to wait until the next country - usually, if someone wasn't happy at, say Tangerine Cafe, they would get to pick a pastry at the Patisserie in France). If you want to stick to traditional meals, again, educate yourself on preferences. You can't go wrong with a nice batch of Fish & Chips in the UK. The pastries in France, Morocco, and Norway are wonderful. I also think the skewers in Japan (Yakitori) and the various sausages and wursts in Germany are pretty solid, too. Mexico and China are not as good to me, but this is a double edged sword. Again, if you have picky eaters, these provide some familiar tastes people can be happy with.
MGM and DAK both have some really nicer, upperscale stops. In MGM, check out the cafe attached to the Brown Derby or Studio Catering for some good sandwiches and foodie meals. The traditional Fare is all down Sunset Blvd. DAK is the other way. Both Flametree and Tusker House are not to be missed. WIth adventurous eaters, I would also suggest hopping over to Boma for dinner while you are there. It is top notch, and all you can eat!
