I've tried to learn vi for years. The simplicity of this tutorial is the first thing that allowed me to "get it." Maybe I'm just ready at last, but the quick tutorial gave me just enough beyond what I needed to know before (i/r/:wq) to grasp its power. I've tripled my vi knowledge without being intimidated.
Years didn't do it but less than 40 minutes (since this was published) got you in. I'm either missing something or you haven't put your time to good use.
Try vimtutor in your terminal. It's supposed to take 30 minutes.
You'll miss a lot of things from the tutorial the first time but you can come back to it as often as needed. You also shouldn't go any further than the tutorial until everything in it makes sense. Once you're at that point, you'll be autonomous for finding new commands and a happy vim user.
I may sound mad but seriously, what's with the a-web-app-for-everything madness?
Point taken, however I work sometimes in a large open plan office with administered win7 pcs and command prompt disabled. I can use this site to do some practice for a ten minute burst with headphones on just as an 'interaction break'.
Sounds like someone pissed in your Wheaties this morning. Anything to get more people to give vim/the vim style of doing things a chance is always cool in my book.
The reason it being on web is that it's a low barrier to try out, and it concentrates on the first steps; in my opinion, systems should provide a gradually progressive way to learn them.