We got a room at the GCH once near Downtown Disney and the drums beating was really annoying. When I asked the desk how long does this go on they said until 10pm. I told them that it was unacceptible and they moved us to a much quieter location overlooking the courtyard. We have stayed at the GCH almost every year since they opened and the only time noise was an issue was that one time near DTD. Even the street view standard room was quiet. Courtyard was probably the most tranquil , but pool, park view, street are all quiet. No music at the pools but kiddies playing.
We have stayed at all three resort hotels and the GCH is our favorite. PP is also quiet,no pool music and gets no DTD noise.They pipe in the fireworks music on the third floor where the pool is and is a somewhat good place to watch the show. You can walk across the street and use the GCH entrance to DCA or use the GCH as a short cut to DL. If you can afford it, I recommend GCH . You cant beat the location