I think that Disney is worth it, however, I am just not a huge fan of the AS resorts.
For $500 dollars for 2 nights for 2 rooms, have you looked into the home away from home facilities? They will house more people, more comfortably.... are set up more like a living area than 2 hotel rooms, have nice amenities, and you could save money by cooking in, if that is your kind of thing.
I would suggest a little more research before you settle.