These benches along High Street have always baffled me. I have never once seen anyone using them, not even to sleep on. These pictures sum up the problem with this bench placement pretty well:
It would probably make more sense to put these benches somewhere with a scenic view, rather than a view of a somewhat high-speed one way street with a park somewhere beyond. The area right around the Deering Oaks Pond lacks benches, so I would propose a quick fix of moving some of these, if not all of them, over there.
*Update - Someone is seen sitting on one of these benches on Google streetview. What are the odds?