I've been using Vim for a while, and this is one of the best-organized overviews of Vim I've seen, partly because he doesn't try to enumerate every single key combination (which is the wrong way to learn Vim - the right way is to synthesize the way that the individual operations are logically combined, though that admittedly takes some time). The best two pieces of advice he gives are (1) not to put anything in .vimrc without knowing exactly what it does, and (2) don't use too many plugins.
At this point, I actually don't think I really use any plugins regularly. I have nothing against Vim plugins in general. It might be a bit faster to install a choice few, sure, and someday I might try and figure out which ones work best for me. But for the time being, I'd much rather know how to navigate my file or project with just the standard set of operations and minimal configuration. That way, I can launch Vim on any machine and start using it, without needing to waste time setting it up just so I can use it properly.
(Disclaimer: I have mapped Caps Lock to Esc, which is indeed a major problem if I use another person's computer. I've gotten used to seeing "E492: Not an editor command: W" practically every time I type on a friend's laptop. But it saves me so much time when working on my own machine that it's worth it!)
In short: stick with Vim long enough, and you'll find that you don't really need many plugins or much configuration for it to be incredibly useful. They help, but not as much as you might think, especially once Vim's standard keybindings become part of your keyboard reflexes.