I tend to agree with Yehuda Katz (a Janus co-creator) that training wheels like that which Janus offers are the best way to learn Vim. http://yehudakatz.com/2010/07/29/everyone-who-tried-to-convi...

I learned Vim the hard way because I was a student at the time, I was required to do so (or Vi at least) and I had the time to invest in it. For people learning Vim on the job, the choice is either use expedient shortcuts or go back to TextMate. Better to start this way and gradually work towards the bare metal.