I use it as an educational resource mostly, there's a "How to" for pretty much everything.
I've most recently learned how to make armatures for Fimo sculptures, replace sticking joysticks on Nintendo controllers, replace a cracked camera lens on Samsung smartphone, fix a leaking toilet cistern, restore pressure on a central heating boiler, all sorts that I didn't know how to do before.
I also like little mini documentaries that tell me something factual (usually historical) that I didn't know so much about.
It makes my teeth itch that my daughter just uses it as the equivalent of mental chewing gum, watching endless "reaction videos".
Sheesh, whoever thought there'd be an entertainment niche for those who like watching videos of other people watching videos?