In my estimation, there's not much to commend about Pop (sorry Pop fans, just not my cup of tea!) But looking at my list of things I didn't like about it, bus service isn't one of them.
I just got back, and the waits and crowds for the buses at the Dolphin were as great as those at Pop, as far as I could tell. The virtue of Pop's busses are that they don't share with anyone else, and they only have one stop. Yea, it's a big resort, but having one bus stop means a lot. Sure, the lines can get long, but I don't ever remember not getting on the first bus that came. The busses for the Dolphin also serve the Swan, YC/BC, and Boardwalk. So while there were never more than 10 people waiting with us at our bus stop at the Dolphin, by the time we were on the road to a park, it was invariably standing room only on the bus anyway.
Say for example you want to go to AK. At Pop, you get on the bus, stop to drop some folks off at Blizzard Beach, and continue on to AK. Pretty simple and relatively quick once you are on the bus. At the Dolphin (a "deluxe" resort, mind you), you get on, stop at the BC, stop at the YC, then stop at the Boardwalk, then stop at BB, then on to AK. It seemed to take for ever! (Of course, the S/D's location makes up for this by being able to walk to MGM or Epcot).
And, I don't know where you are getting the 1 1/2 each way. Not even when everyone poured out of the PPP at midnight did it take 1 1/2 hours, and the line was so long that I think we got on the fourth bus!
Don't waste your money on a car.