My wife works her ass off. If she were a stay-at-home mom, shit would squared away. That's the catch-22: Chances are that if you have a wife that wants to do it, she probably won't be good at it. If you have someone like my wife who you think would be good at it, she's probably too driven to stay home.
By the way, on the grocery topic, I kind of like going on a leisurely trip through Meijer with the wife. We have a weekend ritual. She likes the company and I like making sure that we get good stuff. Plus, it's my opportunity to pretend like I care about our food budget as we try to keep it under the target amount. When I go to the grocery by myself, I seldom look at prices or even know how much I paid at checkout. I just throw shit in the cart and get out.