Agreed!
Batman has (I guess) about 600+ villians...and we only see the same 2 dozen over and over. And Lex is heavily overused.
I suspect the Phatom Zoners are overused for the same reason Bizarro shows up often...they can provide a real challenge for Kal...aside from natural disasters, one-shot monsters and one-shot aliens.
Some posters feel Superman versus bank robbers could be a great story. All I can say is that...it's not a story I would pay to read.