I'd name "Farting around with config.sys and autoexec.bat" among the things I enjoyed the most in my life. That's a pity you can't find a job to be paid for this nowadays...
I loved tweaking AUTOEXEC.BAT so much that I created a front end menu shell which could be end user customised that at one stage became the de-facto program launcher for an entire state government here in Australia for a couple of years in the '80s.
The Greek roots of “nostalgia” translate as “the pain of returning home,” so it’s a false dichotomy. :)
And personally, I currently have a bad case of emacs configs.