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It's one of the things you just can't do without once you become accustomed to it. I can not imagine going back to needing root privileges just to install or try a package, or being unable to roll back to earlier revisions.

I hear Nix even works on macOS too! :-)

How does using nix on other distributions work? Can it access their local packagemanagers and install the distribution-packages, or is it a parallel world that just happens to live on the same machine?

It's a parallel world. The other package managers are too imperative to deal with in a declarative manner and would just be painful, though there are attempts to do so (outside of Nix). Nix installs everything to /nix.

nix doesn't have a package on OpenSUSE so you need to manually instlal, guix does have one though

Nix doesn't really come with packages to be installed, you can create one though.

You install it by running this installation script: https://nixos.org/nix/install

It should work on any Linux and OS X.