I can only say there is no part of my pool that doesn't get a lot of use. Probably the least used is, believe it or not, tha spa. Not that it isn't used a lot, just not as much as everything else. The sun shelf, bench are used by adults, kids and even the occasional Golden Retriever. The main body of the pool for swimming, volleyball, water aerobics, and just hanging out.
We love the sport depth, it's perfect for every use except diving, and I'm of the opinion that diving is not safe in any typical residential pool. Very few pools have a deep enough and large enough deep well to completely eliminate the possibility of serious injury. Four or five feet is plenty deep enough for swimming and great for volleyball and anything else in the pool.