Everyone I know butters sandwich bread.
Not me. I’ll only butter a tuna melt or grilled cheese sandwich. I’ll eat butter on bread at a restaurant from time to time but lately just prefer to dip it into a vinegar dressing if available. Or I’ll melt butter if lobster is on sale.
And actually, we rarely have butter. The wife mainly buys some kind of margarine. Not sure if it is any “better for you” or worse. We do have real butter she uses for some cooking. I don’t even butter the pan before making eggs. That drives the missus mad :-)