Honestly, I rarely look at the date of the eggs in my fridge! They last a while (although I can tell the difference between old eggs and fresh ones).
I think an expiration date is a guildline - especially for the store (most of them say "sell by", and shouldn't be bought after that). On milk, I look for the farthest out sell by date, and then again make sure the oldest milk is drunk first; I usually only look at the date beyond that if it starts tasting funky. Same for most foods. But I'm pretty laid back and maybe too much. I always hear "when in doubt, throw it out" ... I just hate to waste food that is still edible.