I know alot of people will tell you they have done this and there was no problem. We were at Disney last Monday. When I went to use my ticket for some reason it would not register, ( I am a florida resident) and I had to show them my Fl drivers liscense.
I personally would not take the chance. To me it is not worth the embrassing situtation of being turned away it would cause. I know it seems like alot of money to go into the parks, but truthfully where else can you go and see and do as much as you can (live parades, live shows, rides,ect) at Disney or other parks. Alot of place you pay to get in and then you have to pay for rides and it really adds up to more than you spend getting into Disney.