Maybe not Linux per se, but certainly learning how to write scripts and other technical stuff, to automate boring tasks or alert me of things, or writing applications to do things I need, has been a massive time saver - but also a time waster as I enjoy it, and probably spend longer on these things than the amount of time they’ve saved.

And as footnote, it’s always easier to do this stuff on Linux than Windows… plus you can stick things on a Pi so it’s cheap and quiet.