I learned way into my adult life that I could just turn the swivel hook/latch to quickly unwind the cord on a vacuum cleaner.
Before that moment I would manually unwind the cord just like I would wind it up. To make it worse, I even remember wondering why the swivel hook was there thinking it was poor design.
I've seen two different "systems", one where you do a quick pull on the cord and it spins back up, and one where there's a "roll up" button on the machine which winds up the cord, but I've never heard of anything you can do to make the unrolling easier ? Video ? Link? What is this magic you talk of ?
You're thinking of a vacuum cord that automatically winds onto a spring-loaded reel, commonly seen on canister vacuums.
They're talking about an upright vacuum where you manually wrap the cord around two hooks. One of the hooks can be rotated so that it no longer keeps the cord in place.
Look at the two black hooks in front of the yellow cord in this picture:
They're still available but they only seem to make them for professional cleaners (hotels etc) in europe. And they get big and you probably don't want them in your home.
Before that moment I would manually unwind the cord just like I would wind it up. To make it worse, I even remember wondering why the swivel hook was there thinking it was poor design.