Essential YouTube is an experiment to improve user experience by stripping the redundant away and focusing on the essentials.
Features: Disruption-free Search The video keeps playing even while you are searching. Instant Search See the results as you are typing. Queuing Queue videos as you like to watch them consecutively. Looping Loop a video forever. Hassle-free Video annotations are disabled by default. Also, no Autoplay, but the videos you want to play. Client-side There are no servers in-between you and YouTube; everything is done on your computer and it's open source. As private as it could be.
Obvious it might sound, but please keep in mind that Essential YouTube is an experiment, and as pleasing as it might be to use, it's not intended to be a replacement for everyday use. Missing functionality is not a bug, it's a feature.