Yep, exactly the same experience as me. The fact that everything is declarative and revertible means that I'm much "braver" than I would be with virtually any other Linux.

An example I have given before, but there was a weird quirk with my ThinkPad with Linux, where with USB keyboards, if I hadn't been typing for more than a minute, it would have to "wake up" for about four seconds, so I'd lose the first couple words that I was typing.

Fixing this involved playing with a few boot parameters, which can be scary to play with on something like Ubuntu. The issue is annoying, but nothing I can't live with, so if I were on Ubuntu or something I probably would have just tried to live with it, but because it's NixOS, I realized that the worst case scenario is that I reboot and choose an older generation, so I did a few experiments with boot parameters and fixed it.