Our garage is like yours now, detached and away from the house. My husband has taken it over for his boat building hobby so we don't use it as a garage. Our driveway comes to the front of the house and our kitchen is at the back so I just bring groceries in through the front. When I have a large grocery order to bring in, if my husband's not around, I have one of those large old lady shopping carts that can handle about 4 large bags at a time and I use that. No problem. I just wheel it into the kitchen. If I used my garage regularly to put my car away, I wouldn't want to have to come and go through the basement to access my car, let alone schlep grocery bags up the stairs. I don't know how important it is for you to put your cars away at night or how old you are, but the older you get, the more you'll appreciate things on one level.

I've also seen a house with a car port on one end (kitchen) and a garage on the other