There's one use case for Ansible that it handles amazingly well that seems to get ignored pretty frequently. It's an extremely useful tool for setting up the same machine it's running on using the local connection type. I've been involved in projects where we setup a small-ish bash wrapper script that can be curled onto a linux machine or mac that installs Ansible, asks a few user specific up front questions, and then installs the rest of a relatively complex development environment. It took a while to build, but makes setting things up so much easier to deal with.