I don't know if there is a map but we've taken the launch many times so I can try to help. The docks are right in front of the main entrance to the MK. There are overhead signs directing you to the correct boat....boats to FW&WL, ferries to the TTC. The one for the GF and Polynesian is usually the furthest to the right as you face the lake. It's sort of tucked behind the ramp to the resort monorail...usually. For a while it was more centrally located, but it's been back to its' usual spot on our last few trips.
You will go from the MK to the GF before the Polynesian. The return trip is faster as it's direct from the Polynesian to MK. And sometimes only one launch is operating so you may have to wait a bit. We do love them though. It's so relaxing to return to the resort after a busy am in the MK.