In my experience (in the US) it is the one person paying with a check that does that. And checks are extremely common in grocery and other big box stores here.

In my experience (in the US) it is the one person paying with a check that does that. And checks are extremely common in grocery and other big box stores here. Cash is usually not a significant slow down compared to debit or credit, possibly in part because of time spent fussing with PINs or signing receipts.