We book two cars now, both pick ups from airport as O/H doesn't want to wait until 10am to pick up car next day. His car we take back to Alamo on 192, as we're able to drop off luggage at downtown disney we only need one car to take us back to airport.

You can book the car to pick up at your hotel as it's a Dollar rental site, it will cheaper from this site than booking with Dollar direct. Everythings included so no hidden extras. If you have time then I recommend you enrol with Dollar Express, it can save time when picking up car as your details will be pre-registered.

Have a look at Mears buses, it may be cheaper than a taxi. It's been a few years since I used them when we stayed in a hotel/motel. Your hotel may even do a transfer service from airport.