When I was growing up, commissaries I went to with my parents were closed mondays, as was Whidbey and some others I frequent since I've been in. I find that now, it's rare that I wait in line more than 5 or so deep, exception being the odd times where payday falls on a friday of a 3 day holiday weekend with a superstorm forecast for the next day. As a kid, when the cashiers still had to find the price tag and type in the amount of every item, I remember 20 or 30 folks in line. I still am in the habit of grouping items on the conveyor belt like my mom taught me to make it easier (and quicker) for the cashier to type in all the prices for the same items, although making sure the price tag is on top is not required anymore.