Unfortunately, for the most part, WDW's transportation system is designed to get you from your hotel to a park, not from hotel to hotel. With most hotels, you have to take a bus from your hotel to a park, then another bus from the park to the other hotel. (Exceptions include the resorts that are on the monorail -- and I think hotels like the two Port Orleans hotels, which share buses with each other.)
I once tried to go from a park (Epcot, I think) to Downtown Disney. Never again! It was soooo frustrating and time-consuming. Had to go to a hotel, then wait for a bus to DTD. Grrr. Wish I'd taken a taxi for $8!