At this point I've spent about ten years learning Emacs. I'm sure there's still plenty I could learn that would make me even more productive - Emacs is big.
When I was in my early twenties, I decided enough of my heroes at the time raved about Emacs that I should just trust them and not care how long it took to learn or how hard it was. This turned out to be a good decision.
This is pretty much the reason I decided to give it more than the normal five minutes of attention that shareware gets before a decision is made. A great number of people that are way smarter than me think it's the best thing since sliced bread. And by definition they can't be all that stupid :-)
When I was in my early twenties, I decided enough of my heroes at the time raved about Emacs that I should just trust them and not care how long it took to learn or how hard it was. This turned out to be a good decision.