Well this went nowhere, but I'm determined to share some of my subs (with links to good starting points).
Make me giggle-
AirForceProud95, the ultimate in flight simulator realism!
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BardicBroadcasts, you haven't seen a board game reviewed ultil you've seen a Bardic Broadcast!
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TwoSetViolin, two dudes having way too much fun playing violin.
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Jeb Gardener, classical music, hydroponic gardens and a weird guy growing stuff in his office.
Bingeable builders-
Bad Obsession Motorsport, one of the most thorough, ambitious and tea-fueled Mini restorations ever undertaken. Project Binky is a must watch!
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Clickspring, there's just something soothing about watching this guy masterfully make stuff in his shop. The skeleton clock series is a great place to start!
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Hand Tool Rescue, watch weird old tools get restored to good working order. Also soothing.
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Matthias Wandel, a clever guy in his basement makes tools, and makes things with the tools he makes.
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Primitive Technology, a guy in the jungle makes huts and other things and it's surprisingly cool to watch.
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Tips from a Ship Wright, a little slow paced probably for most and not a lot of entertainment value, but he builds some neat boats and is really thorough.
Solid regular content-
Chris Fix, you will definitely think about trying to fix your car after watching this guys excellent how-to videos
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EVNautilus, just the weirdest stuff ever from the bottom of the ocean... the next best thing to being a marine biologist is listening to them ooh and aah over strange ocean life.
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Bon Appetite, just a good fun variety of cooking content. Well produced.
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Mustard, fascinating short documentaries on the history of various prototype planes and trains
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Summoning Salt, fun to watch recaps of the world fastest completion records for various games.