I try to make it a practice NEVER to get in a grocery store line behind a little old lady, or somebody pulling out a checkbook. I prefer to line up behind men since they usually pay with cash and are out of there!
And I NEVER take my purse into the grocery store with me, since I drift away from my cart while I'm shopping and I don't want to have to lug that thing with me. It stays hidden in the car. I have a grocery store uniform: jeans, and tennis shoes, mainly. When I pay (probably with debit card from my jeans pocket), even if I get cash back, it goes straight into my jeans pocket, causing no delay. I've got this paranoia about somebody easily trying to snatch my purse, either in the store or in the parking lot, so going the route of the jeans pocket makes me feel safer. Guys do it, so why shouldn't we? How many times have you heard of a man being physically ripped off at the store or in a parking lot? Basically...it just doesn't happen. Women with purses are easier targets, I think. And what all is in there that you need in the store, anyway? Absolutely nothing that I can think of. My checkbook fits nicely in my back pocket, thank you.
I am all about making life easier/simpler on me as often as I can.