The grocery store where I do most of my shopping has very narrow aisles. If I’m buying enough stuff that I need a cart, I will usually park it in an out-of-the-way spot (or as much out-of-the-way as possible), then pick a couple items off the shelf and bring them over to my cart, and go to the next shelf and repeat.
Other people take their carts into the narrow aisles and just totally block them so nobody can get through.
On the other hand, I have to say I really enjoy shopping there late on Friday morning. The store is really crowded, but everybody is lined up so nicely at the cash registers – men in one line, women in the other.