This extension has become essential to my youtube viewing. Being able to categorise my favourites saves me so much time. I have my music, my games, my speedruns, my art videos, all in separate categories. So I can see what I need without having to visually sort them myself.

Speedrun channels can drop 20+ videos in one go, so I have them in an excluded list by default. This means they don't show up in my subscriptions unless I actively turn them on. I'm still subscribed, this just gives me even more freedom in how my sub page looks.