Same. As someone who is OK with a small amount of maintenance every N months, but keeps forgetting how things are setup or what I did, moving absolutely everything into Nix and running NixOS made things a hell of a lot simpler when you come back after 6 months and can easily find where and what to change, as long as you take care to declaratively set things up via Nix as much as possible, and use git.

Helps that things are really easy to test too, spin up a new test VM with your new config and copy of real data, check if it works, then apply the change to the real hardware and you're good to go. Alternatively, do it live with a copy of real data, then rollback in case it doesn't work.