I was never that in to coupons. The only type I used were point-of-sale (my Marketing prof would be so pleased I remember this term). Basically, unless I could get them at the store I never used them.
Then I became a Mom, and I started carrying coupons with me in my wallet. Our fridge is overflowing with diaper, laundry detergent and battery coupons. Now when I make a list I check the fridge to see if we need to buy anything we have a coupon for. And I'm still a point-of-saler. When we go to a certain grocery chain that has a bunch of coupons at the entrance I think I annoy my Mom by the amount of time it takes me to look through them all. I know I annoy Chris, because sometimes said point-of-sale coupons add a purchase that was not originally on our list.