We always ask for Congress Park or the Springs. I stayed in the Grandstand section once and it was probably my least favorite location (and I've stayed in the Paddock section right next to the Carousel section). I'm sure it all comes down to priorities. When I stay at SSR, I visit Disney Springs frequently. The Springs gives us easy access to the boat and Congress Park provides a short walk. I also like being near the main building for dining, the gym, and the main pool. I'm willing to walk over if we're placed in Congress Park.
I think, I've heard people talk about a different way to walk to Disney Springs from the Grandstand, I could be remembering wrong. It's kind of close to the main building and some people value the bus stop order. That's what comes to mind for the benefits.
OP: I would do SSR with or without a car, the size doesn't bother me, but I'm the type of person who likes walking. I would, actually, prefer to stay at SSR than say AKV because I want the opportunity walk around nice scenic areas.