Add in the bonus confusion that you may not have even been trying to run vim, and in fact may not know what it is (hey, everyone's a beginner some time), but have landed there due to a default $EDITOR value.
[EDIT] also, a typical mid-level computer user's tendency to slap "ESC" when panicked. Ha!
I dunno if it's actually vim or some variation on it, but it is the default on, for example, Arch Linux, although I believe most other distros dropped me into it as well (e.g. git commit / rebase -i).
If there is such a thing as user hostile in the world of CLI tools, then dropping the user unannounced into vi with some open buffer most definitely counts as user hostile.
If vim opens and that's the first thing you try, then it'll work, yeah.
But if you've typed anything, this won't quite work. <ctrl> c will take you out of insert mode, but won't offer any prompt. <ctrl> c again will bring up the quit prompt, but that's not intuitive the way doing it the first time is. And if you type the wrong thing after the first <ctrl> c, you'll break back into insert mode and have to take another run at it.
I remember getting stuck in vim because git bash uses it as a default editor. It happened when I forgot to enter a commit message, which meant that I started typing a commit message and thereby lost the useful prompt when I went to quit.
edit: per another thread, this gets far worse if you don't realize the ':' is active and not a prompt to "type: quit". That error sets off a maze that will never show you the prompt again to find your mistake.