For me personally, groceries are going once a week for my wife and I. Basically get enough stuff to eat for the week, and meal prep for lunches at work.
The world over where you shop for 2-3 days is also largely by necessity, not out of choice. When I worked overseas in London, would have a tiny flat with a tiny refrigerator 1/2 the size of an average one in Edmonton. Lived and worked in the CBD, and was fortunate to have a grocery store a couple blocks away. Had to walk, because I didn't drive there. So I guess I just like to make the point that people (on average) walk out of necessity, not out of choice (there are some that choose to, and for sure they are out there, but these are largely a minority).
Apologies if I misconstrued what you wrote, but I took it as vilifying people who drive instead of walking. I guess I just don't want to be defending myself for choosing to use a car, when for me, I can make a choice of what's most efficient for my situation. It's also probably why so many initiatives aren't overly effective to get people out of using cars. There is the capacity to drive, and it's affordable. When Edmonton gets dense where this isn't the case anymore, I feel only then will cars be less impactful on our decisions (and yes, we should be planning for that, but not at the expense of people's current utility).