It always seems to take longer for somebody to pull the card out, swipe it, go through the menu options, wait for it to get approved, then sign it than just handing over the cash. Maybe it is because the grocery store I use has an automatic change dispenser, but getting change back takes no time at all. No matter how much stuff folks are purchasing when they use cash, the lines just seem to move faster. It could definitely just be a perception, but when I have to use a card, it just feels like I'm waiting forever and people are staring at me waiting to get done.