Well that is pretty neat. Thanks for the mention of nixos-shell. I've been a NixOS daily-driver for the past 6 months or so, but I am still picking up new ideas on a daily basis. :)
It's been my daily for not much longer than that, and almost every time I play with NixOS itself I get the sense of wonder and possibility in computers that I haven't had since I was a teenager. It's definitely a force multiplier.