The bore snake is a field tool, plain and simple.
As such, I think it performs superbly, and most importantly, no excuse not to have it when you need it. A multi-day hunting trip, or you fired only one shot, or there seems to be some debris or moisture in the barrel.... perfect. Who bothers to carry even a collapsible rod with him? Run the snake through, barrel clean. And it fits in any side pocket.
If you're one of those obsessive-compulsive people who clean their guns regularly even without having fired them, the snake is also great.
As has been said, obviously, a thorough cleaning after a session at the range is a different story.