Here are a few suggestions, but you will find many, many more if you look through the Dining Review board.
Cape May -- great salad bar, veggie dishes on the buffet, the Chef has always made us a special pasta with veggies if the pasta dish has meat in it. One of the soups here is usually totally vegetarian ( no meat stock), just ask the chef.
Tusker House -- so many choices on the lunch/dinner buffet -- many similar to Boma.
Spoodles -- always has a veggie option on the menu, usually can offer you one more (gnocci with veggies), and will take the meat/fish out of a couple of others. FANTASTIC selection of veggie appetizers.
California Grill -- always a couple of options on the menu and HIGHLY accommodating
My favorite CS options:
Boardwalk Bakery -- grilled veggie paninin sandwich
DHS Backlot Express -- grilled veggie sandwich
Epcot Sunshine Seasons -- vegetable lo mein, cuban sandwich, often have truly vegetarian soup
MK -- Columbia Harbor House -- veggie chili
Epcot -- Tangerine Cafe -- humus, pita, tabouleh, falafel