For me, it's more a matter of hurting my back, so I will opt for bringing my shopping cart with me and loading everything into that for one triip or, if I forget my cart, I will make a second trip.
I have one of those folding carts with wheels that I can put in my trunk. I have about a block and a half to walk from my garage to my building, so I prefer to use it rather than strain an already bad back.
Okay...so what I am asking is do you take one trip from the car carrying as many bags as possible...or will you make multiple trips to and from the car?
I live across the street and a block away from a grocery store. So rarely do I need to make two trips, even though I don't drive. So it's convenient for me. Our city has banned single use plastic store bags. I have really good durable reusable bags. I can fit a lot in just two of them. Sometimes a bit heavy, but I'm not going far to go home, thus I'm okay with it.