Once you have mastered these simple concepts, most of the magic comes from (1) combining them (2) googling the things that you intuitively know must be possible, and discovering how they're done, which in turn gives you more basic concepts.
At that point, your feedback loop gives you escape velocity, and you'll never willingly go back to a standard text editor again. :)
Getting escape velocity is really tough, though.
Well, that did it -- I went back to my desk, and pulled up vi-tutor.txt, then never looked back.
Vim is extremely intuitive in its compositional behavior; I have never used "67w", but I know exactly what it would do because of composition.
I think "discoverability" is closer.
Vi is a completely different way of thinking. I would compare it to learning to program. When you first start, there isn't very much that is discoverable. You just have to sit through the learning. Once you do, you have access to a lot of power.