Hello KD21,
We just cruised on the Legend's sister ship, the Carnival Miracle. We were in cabin 8271, directly under the aft pool deck. And yes we could hear people dragging lounge chairs around up there, at almost all hours.
Now hubby sleeps like the dead, so it didn't bother him. And I'm a night shift worker, so although I hear things while I sleep, I learn to tune them our easily. Still, I imagine, that if you are easily bothered when you sleep, it could be a problem.