I'm trying to think what I buy regularly that has an expiration date on it. Cheese and yogurt are the only dairy staples I buy (and they get eaten pretty quickly). I rarely buy bread. Meat gets frozen until use. I regularly have fruit and veggies go bad, but that's just our normal MO when things get busy.
Of course, I'd probably notice more if I checked expiration dates before using.
If it's not green and fuzzy, it's good.