It's not that bad if you just want to use/configure existing software - I often find exactly what I'm looking for by googling "[software i want to use] nixos". It gets harder when you start to write your own derivations.

That is true of any distro. Packaging software for NixOS is still easier than arch or Debian.

I maintain multiple packages on the AUR and PKGBUILDs are pretty easy to understand imo. I only had a look at one or two Nix package builds and they seemed much more complex to me.

The nixos module and their tests make it very discoverable how to run many services. Where in arch I actually have to read where programs put there configuration, in NixOS I can already start configuring. Also github search is very value just put the nixos option + lang:nix and you find tons of examples.