It's actually easier this way because you keep everything in one place.

I edited some file on Ubuntu to merge my audio channels into one because one of my speakers broke. Do you think I know what change I made to what file now? When I update, do you think I can merge my changes with the new file and make everything work? Of course not, I am several years into forgetting what I did

But configuration.nix is one file, I usually get a deprecation notice for some stuff and just change a line here and there from time to time. All of my changes are in there and they are in git. When I switched to flakes I also added flake.nix in there, but it's still just two files in one folder I play around with. Not only that, but the maintainers already gave me the options I need for my services. I don't have to follow some guide online to set something up, I just enable it and it works immediately.

For example, enabling iwd is:

networking.wireless.iwd.enable = true;

I just did that and it worked. I commented it out and it went back to whatever the default package is. Is this as easy to toggle back and forth in other distros?