About a year ago, we started binge watching a single show at a time at my house. We typically pick something with at least four or five seasons, and then whenever we're looking to "watch something" the answer is always the next episode of that show. Yes, we stray from it to catch new episodes of other programs, but having that "one program" helps eliminate the need to scroll through television offerings and suggestions to find something when we're really just looking for something to play in the background.
Neverthink is kind of the same concept, but for YouTube. With the Android and iOS app (and website) you can switch to a "channel" and watch themed videos.
If you want to get a little education while you're killing time you can select the "Learn Something" channel, it you want to laugh, the "Comedy Channel." There are also channels like Tech News, Talk Shows, and Beauty.
The idea is that it works sort of like "TV for YouTube" in that you just pick a channel and let it go. You're not poking around for something on YouTube, and it will keep playing as long as you want, so you aren't faced with finding another selection when your first one is done.
This isn't for watching all the time, more for those times when you're on the train on your way home or looking for something to watch on your phone before bed.
Videos are all hand-picked by the app's staff rather than an algorithm, so while video taste may vary, you're also a bit less likely to run into a dud than you might just aimlessly tapping around on YouTube while you're waiting for that delayed flight to take off/train to come.