Where to start... Let's see...
Ok, first of all, Liberty Tree Tavern in MK has a Pilgrim's Feast at lunch - like a complete Thanksgiving dinner with turkey, mashed potatoes, green beans, and stuffing... massive portion! This meal is only about $15 but an easily shared meal. In fact, one time my mom and I both ordered it, thinking we were particularly hungry that day. Nope! Neither one of us could finish it all! We vowed to never order our own again - we will always share this one in the future.
Any time that you can get a half chicken meal or a chicken and ribs combo - CS locations like Cosmic Ray's in MK and Flame Tree BBQ in AK - also easily sharable.
At Les Chefs de France in Epcot, I found the half chicken meal absolutely massive. It was so juicy and tasty that I actually did eat nearly the whole thing for a late lunch one day, but I kinda couldn't fit anything else in me for much of the rest of the day! They also serve baguettes and real butter with all their meals, so if for some reason the meal doesn't fill you guys up, a fresh french baguette with real butter can be a nice way to fill your tummies and satisfy your taste buds.
I've never actually eaten there, but at Via Napoli in Epcot, there are some massive pizzas that people often share. You could have a slice or two and hungry hubby can have the rest.
I also like the idea of having hubby order a meal of his choosing and ordering something like a soup, salad, or appetizer as my entree. Then I can have some of his meal without feeling like I'm taking too much from him, and he can certainly try some bites off what I have too.