Not in the scenario I described: you are coming out of the store, groceries, bags, boxes or whatever in both hands, no free hand unless you first put down some stuff. Ideally no problem, but like I said, imagine it's pouring with rain, everything is soaking wet, where do you put your stuff down? With such a feature, you just swipe your foot under the bumper, the boot/trunk opens, you store your shopping, close the lid, get into the car and drive away.
I haven't got that feature on my car, but I have experienced plenty of situations where I would have been so glad I if I had had it.
Over here, you can get this as an optional extra on many vehicles from various manufacturers. Perhaps "most" was too strong a word, but it is definitely getting more common every year.