My office is around that area too. Closer to GM Place is Fatburger. I like the chicken burger. You can also go to Ebi Ten (one block up Robson from Ezogiku) for quick and cheap Japanese food (ramen/udon, rolls). Or at Library square I go to Salad Loop as well as that Japanese restaurant Little Prince mentioned).
You can also try Kolachy Co. on Beatty Street (past BC Place, next to Starbucks) for homemade 'grab-and-go' food.
Or just go to International Villege food court...