I was an annual passholder for 2 years while living in FL so I did get to eat at a lot of restaurants so here are my choices:
Magic Kingdom: I agree with the Crystal Palace. They have a wide variety of food and to be honest is the only note-worthy place to eat in the MK as far as sit down restaurants in my humble opinion.
Epcot - Future World: You either love or hate the Garden Grill in the Land Pavilion and I am the former. I will warn you to check out the menu first which you can do online because it isn't huge but I love the atmosphere. This is my favorite pavilion in Future world though so I could be biased.
Epcot - World Showcase: There are two trains of thought here. One, grab a smaller item at some of the counters in the different pavilions and just graze around the world. This could work out great because you could get a taco or burrito in Mexico, some desert in Norway, a cup of coffee in Italy, and so on around the world. I have to say it is very hard to pick only one place in WS. I have to go with Restaurant Marrakesh but they aren't very meat and potatoes so I will go with the San Angel Inn inside Mexico. While technically not meat & potatoes either what American isn't at least familiar with Mexican food?
Animal Kingdom: I love the new menu at Tusker House. Boma in the AKL is my favorite restaurant in WDW and Tusker House is like a Boma-light restaurant. They have stuff like couscous and humus but also have prime rib for your husband. I also believe the kids station had hamburgers which an adult can grab.
Studios: I almost never eat at the Studios so I will make a different suggestion. It is a very scenic walk from the studios to Boardwalk where I think you will find better food. My recommendation would be to throw your husband a bone and eat at the ESPN zone. It would be almost impossible to get in if you are going during a big game like the Stanley Cup or something like that so make an ADR but the food there is excellent! I know most people would lump them in with Planet Hollywood type food but I have eaten there at WDW and DL and never had a bad experience.
That is all I've got...have a great trip.