Automation. I'm building a dev environment that does various bits and pieces transparently - DNS, databases, reverse proxying, backups/restores, secrets, stacking/merging/relating containers etc.

I kinda just stumbled into it as the logical way to move forward once the shell scripts I started out with became too complex, but I've fallen in love with it. I'm sure it will be my go-to language for a lot of coding tasks in the future.