Superman and Lois work so well because they don't really have a social life.
I don't believe that's correct. I think Perez had a story where the Amazons opened up Themyscira to the outside world, and WW picked Clark Kent as one of the outsiders to tour the island. But Superman ended up passing on the invitation and said to take Lois instead.
Some nitpicks aside, I do like the Chrissy Beppo character in S&L. Coworkers who became coworker/friends, and now kinda straight up friends.
“Look, you can’t put the Superman #77s with the #200s. They haven’t even discovered Red Kryptonite yet. And you can’t put the #98s with the #300s, Lori Lemaris hasn’t even been introduced.” — Sam
“Where the hell are you from? Krypton?” — Edgar Frog
"They can be a great people Kal-El, they wish to be. They only lack the light to show the way. For this reason above all, their capacity for good, I have sent them you. My only son." - Jor-El
I see a lot of "Lois is too busy to have friends" posts and the only thing that occurs to me is "Clark is even busier and he has friends of his own".
Of course, then I remember Clark's friends are either 1) Work colleagues (be it superheroes or journalists) or 2) childhood friends. But still, that doesn't mean Lois can't have friends either.