The Alamo at the car care center will pick you up at you hotel and bring you back after you return the rental.
We actually live her, and when we fly in late, we just rent a car from Alamo or National, drive home and return it to the car care center the following day. Way cheaper than a limo or taxi and very convenient.
Most of the major rental car companies have locations within WDW or the DTD area hotels. Check out the sticky for what companies are at what locations.