We stayed in preferred rooms in 60's section A in September. We had connecting rooms with no problems at all. We were facing the lake and it was *very* quiet. However, every day we would walk by the first floor rooms that face the Hippy Dippy Pool on our way to Classic Hall/buses. Lots of other people did this as well because the walkway between building A and the pool is quite narrow and there were usually people sitting at the tables along that walkway that were spread out and poking into the already narrow area. It was a bit difficult to maneuver the stroller through that so we just walked along the sidewalk next to the ground floor room entrances. I can imagine those room get quite a bit of noise as the pool can get loud too.
We're going back to Pop next week and I'm going to request the 50's section I think. I found that area to be more than close enough to Classic Hall and I like the theming there as well. But really I'm not going to complain if we're in a different section, I don't have a problem with any of the buildings and we won't be spending much time in the room anyway.
Anyway, I think ground floor will be fine for you as long as you're not facing the pool. And if you can't get ground floor, I found the elevators to be fast and efficient so it shouldn't be much of a problem.