Taking a friend's address in inner Copenhagen (a cheap place as she's a student), she has 4 supermarkets within 5 minutes walk (400m).
Taking a different friend's address in the suburbs, he has 3 supermarkets within a 10 minute walk (800m).
In the city centre, there are 10 supermarkets within a 5 minute walk.
The supermarkets in the city centre are smaller, and have a relatively limited range, although in practise I do 95% of my shopping at one. You choose a different supermarket if you need an upmarket/wider selection, but it doesn't matter as it's so close by (exception: if I really need something like a particular lactose free cheese for a recipe, I'll just go to an inner city supermarket rather than checking 3-4 shops in the centre). There is no parking.
In the inner city, perhaps 20% of them are large enough to be selling clothes, a few toys etc. There might be parking for 0-6 cars. Not having to walk across a ginormous car park saves a lot of distance.
You'll need to travel further (on average) to buy a barbecue, tent, etc. I think I remember the large American supermarkets selling this sort of thing — in Denmark, you'll need to go to the DIY / sports / etc shop. This will have a car park.
Example, though you could zoom into any European city and search "supermarket" on Google Maps: https://www.google.com/maps/search/supermarket+in+Herlev/@55... -- Coop 365, Netto, Fakta, Føtex, Lidl and Rema 1000 are normal supermarkets.