Mine are Whatculture, Today I Found out, Toptenznet, Rob Dyke, Beyond Creepy, Metatron, and Nugetnoggin. There are others I watch quite a bit as well.
I hardly ever watch regular tv so when I feel watching something I usually go to YouTube.
Most Helpful Girl
TJ Kirk, MrRepzion, JennaMarbles, Angela Benedict, Ask a Mortician, CreepsMcPasta, GameGrumps, Undoomed. Just a few of my favorites. I'm the same way as you, I usually go to Youtube, but that's probably because only one TV in our house is connected to a DVR and receives channels and that's reserved for the big tuna till he goes to bed.
Most Helpful Guy
I love Rob Dyke! another favourite of mine is idubbbz.