For the best view of the fireworks, request a room over the "World of Disney" store (this is hotel building #5).
My general thoughts GCH
1. The fireworks sound track is broadcast on one of the tv channels (somewhere around channel 45)
2. You can hear the Jungle Cruise skippers shooting their guns.
3. There are stairs in the end of building 5 which put you close to the bag check area and saves a lot of walking. Not recommended if you have a stroller (you have to fold it up and carry it down the stairs)
4. I go get breakfast at White water snacks and bring it back to the room.
This saves a lot of money over room service.
5. The self park - parking lot is directly across the street from the Grand and it is faster to get your car when you leave. There is usually a line of guests leaving and waiting for the valets to get their cars. It also saves $17 per day. (I perfer the self park, who wants to wait in another line, just to get your car)