we are obviously not great cushion lovers.
DH has two in his sofa, I one in my armchair, and there is one in the other armchair that visitors sit in, four in the sofa in the other front room. We have two cane chairs with two cushions apiece.
Do futon like cushions count? DH sits on two at the table since he broke his collar-bone and found his chair an inconvenient height due to restricted mobility.
I sew new cushion covers when the old ones wear out, and have on occasion replaced a cushion with one from a charity shop, but I have never been a fan of loads of cushions.