Some of my favourites. Mostly nerdy stuff, not so much "maker" stuff. :).
Ben Krasnow / Applied Science @BenKrasnow / https://www.youtube.com/user/bkraz333
Ben does lots of neat science experiments in his garage. He's built a scanning-electron microscope, experimented with vacuum deposition, building a ruby laser, and he drives a DeLorean.
Mike of Mike's Electric Stuff @mikelectricstuf / https://www.youtube.com/channel/UCcs0ZkP_as4PpHDhFcmCHyA
Mike does neat installation projects (LEDs mostly, it seems, some pretty high profile stuff e.g. he did part of a big piece in Heathrow). His channel is mostly teardowns of interesting electromechanical gadgets and discussion of interesting solutions to problems he runs into doing his installations. Clearly very knowledgable and I learn a lot from his commentary. Pretty sure he's mostly self-taught.
@tesla5hundred / https://www.youtube.com/channel/UCMdOWi6nBZJ3Q0tHNQIOUVA
Don't know his name, but he's from Vancouver. Doesn't post much, was originally a lot of electric car stuff, now some teardowns and projects. He's working on a custom highspeed camera right now.
There are a lot of others I follow in the same vein, but these are the best and whose content I most look forward to. If they float your boat I can suggest some more.