I just cannot get used to keybinds, no matter how hard I try it just never seems as effective as just clicking and pressing the 1,2,3,4 keys that I can easily reach. I've played my Marauder through HM EV and KP by clicking, and I played a DK tank through HC raids in wow by just clicking and never had any issues and got pretty good at it. Obviously people will say LOLCLICKNOOBLOL but tbh its my game and I'll play it how I want.
75-80 keybinds just seems extreme to me so I'd say just find you're own way of playing and a way you feel comfortable with.