If you just want to watch youtube videos without interacting i.e. no commenting, no liking or subscribing, then you are in the best place. You can search videos or just choose popular categories to get your interests. The videos are all interesting because it uses reddit to get popular or most watched videos.
Because of it's simple and clean GUI or design, you feels different while watching. The fullscreen mode is also supported. Enjoy your favourite videos and kill time easily when bored.