We were on the 8/28/04 Magic and had 2 Cat. 10 rooms, 1065 and 1079.
There was no hallway traffic or noise. Very convenient to exit/entrance for excursions. Laundry room was short walking distance on Deck 2 and a short walk to dining/shows on Decks 3 and 4.
Because you can only get to Deck 1 by midship, there was some walking involved.
We have been on two prior Disney cruises and had rooms on Decks 6 and 7. The only difference was in terms of noise inside the rooms. Both Deck 1 rooms had a periodic humming/vibrating sound which only lasted a few seconds. However, it in no way interferred with our sleeping or use of rooms, and we would gladly stay on Deck 1 again. Another benefit of Deck 1 is movement. We had rough seas one day, and movement was less noticeable on Deck 1.
I hope this helps you......