But I'd like to say that I cannot honestly recall an instance where I was in normal mode and ended up pasting something -- I assume you mean Ctrl-V-ing and having the paste interpreted as commands? -- once I got used to it after leaving Sublime Text, which I'd say took me a couple of weeks of hating myself. It's a matter of how much effort one thinks it makes sense to put into learning the editor, but IME there is a significant payoff, even if it is hard-won.
I'm not sure if it's harder for some people to internalize (which is by no means a value judgment; it's why Emacs/ST/Atom/whatever exist and are powerful) but once that is done, one never gets confused about what mode you're in simply because one is almost never in insert mode! "Probabilistically" speaking, you are in insert mode for 0 time. ;)
In any case, I don't hate non-bimodal editors, just hope that the subset of those using them who have not seen Vim for what it is yet do so quickly. (And, of course, there are those who are genuinely repulsed by modal editing, and that's fine!)
I can't speak to "inordinate amount of time screwing around with plugins": I have a plugin for each language I use, and perhaps four or five others. The rest of my init.vim (I use Neovim) is about ... 30 lines long? It's my experience that most (Neo)vi(m) users use little of the power of plain vi -- I know that because I myself was like that for almost three or four years after I started using Vim. (This is ignoring, e.g. large Java projects, where IDE-style code navigation is basically a requirement if you want to get anything done.) But there is definitely a culture where a customized-to-the-hilt editor is seen as something to be proud of, and why shouldn't it? It's what you "live in", isn't it? :)