Walking to the Dolphin from the Reserve was tiring 😂 Walking to the Swan was fine though. As for the buses they use chartered buses and also the same buses Disney uses, just used for the Swan and Dolphin. However, in my past visits I remember actual Disney buses to the Swan and Dolphin.
As a guest at the Swan, Dolphin, Swan Reserve, you do not have the ability to use a Magic Band to charge back to your room. however, guests staying at the Swan,Dolphin, or Swan Reserve have charging privileges at these resorts.