Half/Twin ropes in alpine climbing, most of the time (on ice etc, I only use single so take my word on this with a grain of salt).
If rappelling, I will have two strands running through my belay device or figure eight, with the halfway point of the rope being up at the anchor I'm rappelling off of. This makes it easy to retrieve the rope, as you just pull one strand down and typically it comes out without issue. Downside being you've got 25m of rappel, since you've got the 50m (or whatever your rope length) rope doubled.
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