I don't anymore. I found myself buying things I didn't normally buy... and then there's the "what is my time worth" factor. As for "Double" and "Triple" coupon days, I think they're illegal in Florida or something because I haven't see a DOUBLE COUPON sign in a grocery store window since I moved from Colorado.
Normally I buy Publix (local chain) brand product. It's typically so good quality, Consumer Reports rated Publix the best grocery store. If I use a coupon, it'll be for brand name product and I end up spending more in the long run. It's just not worth it.
When the national brands go on great sales, I'll partake, but without a coupon. For example, I was in a crappy ass U-Save store to pick up some beer. Walking to the beer section, I passed a Tropicana disply that had Pure Premium on sale for 2/$2.50. That's GREAT! I normally pay $1.99 for one Publix brand OJ. See?
You just have to be good with your shopping habits.