We've hopped exactly once. Split our 7-night stay between SSR and BCV. At the time, we had never stayed in either, and as DVC members wanted to give them a try. It was worthwhile to us, as we found we really like BCV and do not care for SSR. So it gave us a leg up for future visits. However, the transition was hectic and we wasted a good part of one day doing the move. We'll never do a split in one week again. However, we would seriously consider a split if we do a two-week visit, like between AKL or BLTand BCV or BWV.
The reason we would consider that split is that we really like the Epcot resorts location, and feel a letdown if we don't stay there. But one week fills our need, and we wouldn't mind trying something else.