I used Aquamacs for 2-3 years but never really learned emacs until I swapped Aquamacs for Carbon Emacs and learned the real thing. Training wheels is a good analogy. You aren't really riding a bike if you use training wheels and they slow your progress in actually learning. Sure you can get to your friend's house, but you look like a dork.

I found the Emacs Starter Kit (http://github.com/technomancy/emacs-starter-kit/tree/master) and the Meet Emacs Peepcode Screencast (http://peepcode.com/products/meet-emacs) to be awesome. After a couple hours of working through the screencast, I was a 5x better Emacs user than I had been after 2+ years of Aquamacs use. You have to "get" Emacs and Aquamacs doesn't force you to do that. The $9 for the Peepcode screencast was the best money I've spent in a long time.