Having only two AV related channels on my subscription list (AH and Andrew Robinson but don't use either very much), and generally only recently have I even been spending much time on youtube, certainly have no degree
. I do have a few woodworking ones I probably need to spend more time on (my favorite by name at least is Stumpy Nubs), but I think I use these the most
Mark Rober
The Slo Mo Guys (& Slo Mo Guys 2)
SmarterEveryDay
(love slo mo stuff, but don't want to buy a good camera for it)
Adam Savage's Tested
LOL Network
Food Network
Alton Brown
The History Guy