[domenkozar]

It depends a lot from where you are coming from. It seems like you have prior Nix experience:

The main benefit is abstraction using modules: this allows you to extend, compose and abstract your environment. Processes and pre-commit hooks are only the beginning of what's possible.

There's also higher-level CLI interface for building images, sharing environments, etc.

Note that this is only scratching the design surface of what's possible.