I disagree with the posters who dislike Jiko. They have great salads, and a great platter of breads and dips (Taste of Africa). The veggie dish is assorted grains with seared tofu on top and is, in my opinion, delicious. Just goes to show that we have different tastes. Just don't rule it out if the food sounds good to you.
I LOVE Boma...there is so much food there that I can eat that I wind up stuffed! I also like Artist's Point (WL)...their potato and chive potstickers were good and the Berry Cobbler is awesome; I had a great vegetarian dish at Le Cellier, Prime Time Cafe was very accomodating, as is Brown Derby...etc.
For counter service at MK I recommend Columbia Harbor House (lighthouse sandwich, veggie chili), Pecos Bills' (Kit Carson salad without chicken), Cosmic Ray's (veggie burger & topping bar), & El Pirata Y El Perico when open (Taco Salad with beans and rice, no meat). At Epcot, I like La Cantina de San Angel (vegetarian wet burrito), Tangerine Cafe (tabouleh wrap, vegetarian platter), Seasons in the Land (veggie sushi, vegetarian sandwich). MGM's Backlot Express has a good vegetarian sandwich, and the ABC Comissary has some good vegetarian options too. When at AK, I go to Pizzafari (pizza, obviously) and Tusker House (veggie pita sandwich, although I wasn't impressed the last time I had it.
I live in Orlando so I often visit the parks, and I know I've just scratched the surface in my review. I have been to most all of the restaurants on Disney property, so if you have any questions I would be happy to answer them for you!!