In my experience Nix is a force multiplier. But you need someone on the team who has plenty of Nix experience, because you inevitably need to write your own derivations and smoothen over issues that you might encounter in nixpkgs.

We use Nix with Cachix in the team I currently work in. We use a lot of ML packages/kernels, which are nearly impossible to manage in Python venvs (long build times because we have to patch some dependencies, version incompatibilities, etc.). Now you can set up a development environment in seconds. The nicest thing is when we switch between branches we automatically have the state of the world needed for that branch (direnv yay).

It was some work to set up, but it saves so much time now.