If it's going to be a short trip, I find it's not worth the effort to take DS out of the car seat, get him into the wrap, do my errand, and then put him back in the car seat. Since I live in the suburbs, I really do have to drive everywhere.
So I'll leave him in the car seat if it's a short trip. & I tend to be quick with my errands (grocery store, target for diapers, etc.) So he gets worn around the house, for walks with the dogs, & if I'm shopping longer - like when I was shopping at the mall for a bday gift for my best friend.