the rope system is much like something the rock climber dude's use for various antics, but they don't tend to double the rope up.
as well, a modified variant is used for setting up slack and tight lines for walking on, but typically with webbing. good stuff.
the doubled line i suppose gives one a chance to "recover" the line and move on, but you do leave one anchor end behind, rock climber types would probably choose to leave a sling and a rescue ring behind instead of a biner and rope. course, chances are, you could recover it later.
though it begs the question how you got across in the first place
yeah yeah, i know, someone volunteers