The Poly is THE best resort for transportation.

That was the major reason we chose that resort last year. We knew we would be going back for naps & wanted quick transportation. The monorail picks up at the resort or you can take the ferry for MK. Otherwise, it's a short walk (5 min) to the transportation center where you can pick up buses for MGM & AK and the monorail for Epcot.
You can also see the fireworks from MK on the beach. And don't forget to watch the electrical water pageant at night that goes around the lagoon.