Same here. The advantage of Org is that it is likely to be around forever, and it's plain text.

And it offers some very nice interpreters to be used on top of plain text. For example, agenda views can support any workflow you can possibly imagine, from a daily planner to a kanban, without needing to write Elisp.

Org, and in general Emacs have this very nice feeling of giving you tools to build whatever you want. In contrast to much more rigid GUI applications.