Where are you staying? Some hotels have rollaways. 2 doubles, a sofa and a rollaway? Or maybe a kids suite with 2 doubles and bunkbeds? Sounds kind of funny but may work.
guys rules say that its okay to sleep on top of the bed in your own sleeping bag 2 guys per bed 2 girls per bed and somebody takes a roll away or the floor.
I will be honest if you have 4 people and two can share a bed I would suggest an air mattress. It is the easiest and often the most comfortable answer I have found in my hotel stays with friends. In fact we did that this weekend!
I just booked (but decided not to stay) the Paradise Pier: 2 Queens and a day bed for $175 (W/Disney Visa on a Sat.night.)..It's just my DD and me, so we're staying at the Anaheim Plaza for $69 instead!!!!