Unfortunately no, there are no buses that run from hotel to hotel.
As said above you have to take the bus to a park, DTD or to the TTC and transfer to the bus heading to the resort you want to go.
It isn't really a hassle. Sounds like it, but really not.
When we stay at POP we often head to the Poly or WL and we simply take the bus to MK and transfer either to the boat (WL) or the Monorail for the Poly.