Just noticed this post Juliette!!
I think a lot of places do offer pastas as a veggie option, but there are quite a few that have other veggie options too.... The Rainforest Cafe seems to do a couple of veggie options (I believe they do a Veggie burger and a few pastas), the Agrabah Cafe is meant to be very good for veggies, but I would recommend you ring in advance about this one as it only seems to be open certain days when it isn't high season. Annettes Diner does a big Veggie salad that somewhere near us was eating when we there a while ago, and it looked really nice.... The buffet places do have veggie options, but I would advise you asking what the choice is for veggies before you go in as some people have been less than satisfied with what is there for them when they go in. Cafe Mickey did a couple of veggie things if I remember rightly (I'm sure they would probably do a veggie pizza, etc) Another option would be for you to ask if you could have a double portion of a veggie starter served as a main course??? I know some veggies who post on these boards have often posted some good reviews of the Silver Spur Steakhouse.... So theres a few options for you to explore there!!
Bob xoxoxox