Plus, org-mode really helps to make the over-engineered parts more frictionless--I run my life off of org-agenda now, where creating a new project, capturing tasks for it, and refiling them as needed are only a few keystrokes away. Keeping with the theme of hyped productivity books, I also take inspiration from Deep Work to tag certain actions as being ":deep:", so that after clocking into those tasks, I can look at a clock report at the end of the day/week to understand how many hours I actually spent working on "important" stuff. It's very motivating to make that number go up!
I know not everyone feels the need to be so intentional about their productivity landscape--indeed, a lot of very naturally productive people I know explicitly /don't/. But for those of us who aren't one of those magicians, I highly recommend putting some thought into at least a bare-bones system.