What is unintuitive, is the concept of modes. One, because it is a unique concept and Two because many people who accidentally end up in vim have no use for it.
Once you grasp this concept, exiting vim is one of the most intuitive actions:
* [ESC] <- This is the "modal" part, the hard part, what you probably call unintuitive.
* : <- The other part of "modal", difference between commands and navigation. Also a unique concept, that is not hard to grasp, but probably hard to know that one has to grasp it at all.
* quit, exit, close
* Some error may show up, telling you what to do instead, E.g.
* :quit!
That is all: `[esc]:quit` a series of keystrokes that make little sense when you are not familiar with some basic concepts of vim. But entirely guessable, without reading a single line of help, if you do grasp the very basic concepts.