I usually do it like #3 in the OP's video, except I give each loop a "negative" twist to keep it all straight. I whip the loose long end around to cancel the twists I'm giving to the looped side.
When I lived in places where I needed a 50 foot extension, I would use two 25 footers, each of which was easier to store and deploy than one 50 footer. I never had a need for a 100 footer, but if I did, I'd probably just get two more 25s under the same reasoning and not worry about the slight additional I2R losses in the extra plugs.
Terry