I have long-time clients who are Diamond members with Carnival and they sailed on the initial transatlantic cruise.
They complained about some of the very same things you mentioned. They had a balcony cabin on Deck 7, two levels above the Promenade Deck in the middle of the ship and they said it was terrible. When sitting on their balcony, all they could hear were people's sneakers squeaking on the deck, people talking loudly, and people in the hot tubs laughing till all hours. They said they never had a quiet time on their balcony and it was something they had never had any problems with before, but this new design with the Promenade Deck extended is causing alot of complaints. Plus, this design is also causing the balconies to not be as large as on other ships, so they weren't happy about that either. We've heard the exact same complaints form people on the NCL Breakaway as it's the same type of design.
So if you want a balcony on these types of ships, just make sure you get them up around deck 8 and notice where you are in relation to where the hot tubs are!