> Is that really a thing though?

You need to be able to afford it as it it is more expensive, but yes it is.

I have the luck to live in a well served area: I have a Carrefour supermarket at about 200m from home yet I have 3 small markets closer than that. If I have to buy one or two things it doesn't matter if the supermarket is cheaper, in my mind spending 10 euros instead of 9 or 8 is worth it if it takes 5 minutes instead of 15. Moreover instead of having to interact with a bored cashier or an automated checkout machine, I will have a chat with a real person (yes, a cashier is a real person too, but most of the time doesn't act like one) . He will ask me how I am doing, put my stuff in the shopping bag and gasp smile at me. I think we lost sight of how those small things makes our life better.

The interesting part is, I always have to buy just 2-3 things because if it takes 5 minutes, whenever I need I just go out and buy it, so half of my shopping is not at the "big" supermarket.

I have to add though: I work from home, so for me shopping means having to go out just for that. Maybe if I was working at an office the dynamics would be different as I could just stop at a supermarket one the way home.