Depends on the shape of the door and the height of the offending vehicle. Saved me from a heavy steel dumpster enclosure door once, though.
I gotcha, my girls car is literally a point that would wreck a door panel no matter sliders or not. But for everything that is flat and not larger than life they do the job
The mall is a treacherous terrain that only the brave dare venture out to. With retail prices and fake jewelry salesmen around every corner, sliders come in handy when some tourist looses control of their shopping cart full of cubic zirconium and assorted journeys wear.