We were in 8678/8680 (so down the hall a bit) and very few people turned when we did off the aft elevators.
I can tell you there is nothing on the 8th floor but staterooms, so there won't be much traffic except going back to the room. Also the inside staterooms are on the port side of the ship in the aft, so that will cut down the traffic as well.
If you are looking for definite pros: the Dream needs to back into
Castaway Cay, so you will have a view of the activities side of the island, and be right at the aft, so getting off the ship you are right there!
Also, the aft elevators really do not lead to much: Animators Palate (although most people were taking the mid-elevators), Cabanas (so it can be noisy in the morning, I guess), Remy/Palo's (some adults may make a lot of noise), and the gangway for Castaway Cay.