I'm impressed with how quiet SSR is, too. On one trip, we were assigned to the Paddock building that's directly across from the Reedy Creek Fire Department. As we were carrying in our luggage, the fire trucks left on a call with sirens blaring. I said, "Oh my God, we're going to regret this room assignment." Nope. Never heard it again.
On another stay, our balcony was very close to the Paddock Pool. (This was after the refurbishment.) I thought for sure we'd hear the pool noises. Nope. Only when we were on the balcony.
In the Springs, once, we were on a corner room right next to Broadway, and therefore the buses. I thought we'd hear them. Nope.
As with every resort, you'll occasionally hear excited kids making noise walking to/from their room in the hallway, or someone "bumping" around in an adjacent villa. That would be the case in any building, though.
With all of that said, the sections that will be the most quiet are probably Congress Park, Carousel, and the farthest buildings in Grandstand. Congress Park has a quiet pool which might have the possibility of generating some noise, but it's set back a little bit from the rooms. Carousel is somewhat close to Vacation Club Drive, but not so much so that I think you'd hear a lot of traffic noise. The Grandstand buildings on the golf course probably don't have much noise, either, except for the occasional golf ball smashing a car window.

The other two buildings in Grandstand, though, are very close to the pool and water play area. One building (the one closest to the bus stop) has the balconies facing the pool, the other (to your left as you walk from the Carriage House) has the balconies facing the woods and away from the pool.