They are much better for the environment. You can even reuse them. The reusable ones use much more plastic hence are much worse if you don't regularly reuse them.
Which I kinda don't mind, because several times in recent years I ended up with groceries all over the parking lot because of how flimsy they were made. Now you have to pay for them, but at least they're sturdy.
Yeah the grocery is a 10 min walk, but I can't haul a week's worth of supplies for my household by foot in one trip, and I really don't have the time to go every day, so yeah a the car comes in handy for that once a week haul.