Since I assume all the org fans will be in here, does anyone have any recommendations for non-emacs org systems (on Linux desktop)? I don't want to relearn every keybinding, but I love the concept of a simple text-based organizational format with good editor support.

You really don't need any Emacs keybinding if you set up Evil. Like how I use Emacs on mobile, because typing modifier keys is harder, I just use basic vi commands and bind everything else I need to single-character Hydras[0]. If you don't know vi you should probably learn basic commands like copy and save which emacs-tutorial is more than enough for. Actual Emacs and it's ecosystem is just too good to let something that simple deter you.

[0] https://github.com/abo-abo/hydra