You’re going to be using your resort’s buses more than you hoped.
However, usually for the MK, buses break into two routes, either Yacht/Beach or Swan/Dolphin/ Boardwalk.
Depending on time of year and how crowded the parks are, the AK and DTD bus could also be split, otherwise, it’s one bus for all 5, which isn’t much different from the POR’s 5 stops.
There is no bus to Epcot because the International Gateway was built for the Crescent Lake hotels and the only transportation to the Studios is via Friendship (or hoof).
As others have said, once the park is closed, you won’t be allowed into Epcot to get to your hotel and Epcot closes every night (except EMH night) at 9 PM.