(Markdown) has all the advantages of plain text, but with the organizational power of a word processor. The end goal is a minimalist writing system that you can use to get your thoughts down, and then export them elsewhere without worrying too much about the appearance.
I'm a huge Markdown fan.
Geeky? No, just very useful. Over the years, I've lost some great material; either because of failed backups, or because of proprietary software which ate my writing and wouldn't give it back.
These days, I'm wary. I write in Markdown as much as I can, because it's just plain text. I can use it anywhere, and it's indestructible.
I enjoyed the above article. I haven't considered using Markdown for my To Do lists and planning, but it makes perfect sense. I'll rejig my planning workflows to include Markdown. The notion has made my day. (I'm easily pleased. :-))