Meh. I think you're overstating it. To meet your anecdata, I had both the first college year, and single > double by a large margin.

It depends on the person. I lived alone in my last year of undergrad and it sent me into a deep depression. I figured out that living alone was too much isolation for me and moved back in with a roommate. That helped to pull me out of my depression and be able to finish my degree.