The Poly bus stop is an afterthought; it is really just the stairs down to the parking lot in front of the lobby.
I was at WDW last month (not staying at Polynesian) and noticed that the bus stops signs at the destinations have changed; there are separate stops for 1) the Polynesian and the Contemporary and 2) the Grand Floridian and the Wilderness Lodge. However, the one time I took a bus from the Contemporary to Downtown Disney, the bus stopped at both the Polynesian and the Grand Floridian.
I think it would be an improvement to have only two resorts on the route rather than three.
I usually do not have a car at WDW, but on the times I have rented one, I have wondered if WDW is in cahoots with the car rental people since they seem to be making the bus routes even more difficult to get anywhere (especially PI, which is the last place I want to take a car) within a decent time frame.
Once I sat around the GF bus stop waiting for the DD bus for so long that some guy in the group went over and rented one of those van taxis to take everybody at the bus stop to PI.