This thing is an absolute dream come true! I have a TON of playlists. I love the feature, and use it heavily. I create playlists of my favorite videos for different channels, and when I discover a new channel I enjoy, I create a "catch-up" playlist of their old videos. All of this used to be easy. There were various websites that worked with the API to allow playlists to be copied, sorted by length, all kinds of stuff. But bit-by-bit, YouTube has changed the API so that none of these sites work anymore. Now, if you want to build a really big playlist, you have to manually, one-by-one add videos to plalists. Sorting options have always been limited, and now they're even worse.

This extension fixes all of that! Now I have a clean interface, with my playlists sorted by time, and making new ones is the simple task that it SHOULD be natively. Well worth the Patreon investment, and I'm definitely checking out the other extensions made by the same dev.