I wanted to add that when you get a quote from the Alamo website, check both the Car Care center and the Dolphin. On our last trip, the Car Care Center was cheaper. They will send a shuttle to pick you up from your hotel to pick up a rental and will also bring you back to your hotel when you drop off a car.
An airport pick-up with drop-off at the Dolphin should cost the same as a drop-off at the Car Care Center. Unless the price difference is more than $5-$10 - I wouldn't bother going to the Car Care Center to pick-up the car unless I was staying at a non-Epcot resort. Neither would I be taking the bus to Downtown Disney as a previous poster is doing to save a few bucks with Budget.