Very easy to setup. Moreover, when I'm on a different computer and open (vanilla) vim without any configurations. I know that everything is more or less the same as my default vim environment. I think it's not that hard to learn developing in the default vim environment, with some minor tweaks.
Also related, How to Do 90% of What Plugins Do (With Just Vim): https://www.youtube.com/watch?v=XA2WjJbmmoM