I solemnly swear I'll keep it up to date, but then again I said the same thing with the system I'm replacing - which I'd configured with ansible. At the very least all my dotfiles and projects are stored in git, so mostly getting a workable system is trivial - it's things like setting up arduino-studio, firefox (installed from binary releases to /opt, because I want to be current), and similar niggles that are hard.

I can configure hundreds of servers with puppet, but desktops tend to be used for so much adhoc work that is hard to script, that keeping them current and automated is a lot of work.

(e.g. My wife suddenly says "I want XXXX", so I login and set it up, then forget about it for a few years.)