I think suburban and car-oriented grocery stores give people a skewed impression of how time-consuming it is to check out at a grocery store. If everyone is loading up their cart, the lines are going to be long because everyone has to unload it at checkout. By contrast, if most people are there for just a few things, you speed through the line if there even is one.

Bonus if it has a self-scanner like this one to further speed things up, though unfortunately we don’t have any like that near me: https://youtu.be/kYHTzqHIngk