Don’t switch text editors, and don’t use a plugin.
For a few years I used Orgmode. I didn’t use Emacs. That is, when I needed to edit text files, I used Vim or macOS TextEdit. I used Orgmode to track my tasks and keep notes. That Emacs was underneath it was purely incidental, and I didn’t use Emacs for anything else. For me, Orgmode was not a plugin. It was the primary software I used, and there was this Emacs thing under it.
Ironically, these days I do actually use Emacs, and I use OmniFocus for tasks, mostly because OmniFocus gets multi-device sync right so it’s worth the price. But don’t hesitate to use Orgmode even if you don’t want Emacs otherwise.
org-mode is basically better Markdown with a bunch of automated things that don't get in your way unless you specifically put them in there.
The only unwanted feature you're likely to encounter is automatic sub/superscript conversion, and that's documented and easy to turn off.
I'm not recommending org-mode. I personally don't care if you use org-mode or not. I never understood that mentality. But the type of software you're describing is crap, and org-mode doesn't fall into that category.
For a few years I used Orgmode. I didn’t use Emacs. That is, when I needed to edit text files, I used Vim or macOS TextEdit. I used Orgmode to track my tasks and keep notes. That Emacs was underneath it was purely incidental, and I didn’t use Emacs for anything else. For me, Orgmode was not a plugin. It was the primary software I used, and there was this Emacs thing under it.
Ironically, these days I do actually use Emacs, and I use OmniFocus for tasks, mostly because OmniFocus gets multi-device sync right so it’s worth the price. But don’t hesitate to use Orgmode even if you don’t want Emacs otherwise.