The same applies to the customer in front of you. I prefer them to be out of my way with their groceries, 3 kids and 2 carts when I'm trying to pack my stuff.

The same applies to the customer in front of you. I prefer them to be out of my way with their groceries, 3 kids and 2 carts when I'm trying to pack my stuff. "Packing at the window" scales better than the alternative in Germany: to have the packaging area at the cashier's be split in two (#3 will have to wait until the kids of #1 decide whether they want their toy now or in the car).