Org Mode keeps being pushed again and again, but honestly this title is one of the boldest claims I've seen about it. Just look at the document. It's a 400+kb HTML page of Emacs configurations, keybindings and other stuff that makes absolutely no sense unless you've been an avid Emacs user for years. Where is the Plain Text here? I see nothing of the sort. Sure, the output might resemble Plain Text, but it's clearly…
I think it's a perfect excuse to procrastinate. You can spend months configuring Org Mode, tweaking and hacking away, instead of using something like Things, Todoist, or OmniFocus (or thousands more, whichever one you like best) and focusing on the things you should actually be doing and organizing. I've been guilty of that myself.
Well, I mean this does come up all the time, where people talk about how much time they sink into Emacs. Emacs is an interface to a programming language. Of course you can stick time into it, just as people spend hundreds of hours writing code with any programming language. For basic usage, you don't need to. I don't think Emacs needs to apologize for being a lot of fun for experimenting and customizing. Those same people would be scrolling Twitter or Facebook if they procrastinated using Emacs.