NixOS has benefits not just for developers, altough being familiar with programming is helpful.

For me the main benefit of NixOS is being able to keep multiple systems in sync. For that I have 3 config files, the first containing all general config and packages I want to have installed. The other two are for my laptop and pc respectively, which allows me to make system-specific changes. E.g. tlp is only enabled and configured on my laptop.

And NixOS isn’t just rolling release, it also has bi-annual stable releases, which is great for servers.

Rollbacks are also awesome, altough I used btrfs snapshots a few years back with Arch for a similar result. With a bit of setup they are bootable from grub.