They sure are handy for lead slingers and leaver guns.
I would rather use a bore snake than a take down rod, so that's what I carry along with small containers of solvent and oil in my pack when out in the field.
Keeps the rifling shiny and dry, which is important to me. I keep the 1 piece rods at home, and thoroughly clean rifles every 100-200rnds.
I'm not really pro or anti snake. It's a tool... Between 'de-copperings', I may pull a snake through on a half a dozen different occasions. I just ensure the string is centred in the bore as I'm pulling and have seen no evidence of crown deformation.
I have noticed that since I started using bore snakes my chambers seem a lot less prone to rust. Whatever the reason (probably they see more oil than they ever did), it's a pleasant discovery.
I can see how benchrest shooters have no use for a bore snake. If your guns are used only on nice days, and stored in controlled conditions, you probably have little use for a bore snake.
For those of who carry in the rain and snow, for whom gun storage might mean a job-box in the truck, or a scabbard on a horse, the bore snake is a useful and popular tool.