I have been using Ansible for over four years now, my current use case has around 1k VMs and a handful of baremetal in a couple of different datacenters running

I have been using Ansible for over four years now, my current use case has around 1k VMs and a handful of baremetal in a couple of different datacenters running 100s of services. No orchestration as well FWIW, we usually have ansible configuring Docker to run and pulling the images... As for the future I have been meaning to explore Terraform and some Orchestration platforms (Nomad).