FYI, the Poly has a boat that goes from it’s dock to the MK, although walking to the TTC and jumping on the MK parking lot/MK ferry might be closer than taking the smaller Poly/GF boat depending on which longhouse you are in. Likewise, there is no boat from the TTC to Epcot, but it might be quicker to walk to the TTC to board the Epcot monorail rather than board the resort monorail at the Poly lobby and then transfer at the TTC to the Epcot monorail.
The Poly is a victim of it’s popularity and proximity to MK. Lots of casual visitors wander the grounds, eat at the restaurants, and drink at the bars, thus the lines to get on the monorail there. When the Aloha show lets out it’s particularly bad. When MK closes getting on to the resort monorail is a challenge as well.