It was most useful for cleaning up the horror show that is YouTube recommendations if random YouTube videos from searches and chat recommendations don't get tracked to my logged in account. There's still a ton of noise in the recommendations engine and I will never trust auto-play again, but I'm having to block and/or report fewer channels and I don't automatically shudder just seeing the recommendations column show up above the fold anymore (though I still tend to prefer browser widths that drop recommendations below the video I'm watching because what a waste of space that is).