Over the past 3 months we've been using it a LOT. I made one for our admins so they can work with the CMS and get statistics in their client, the statistics part has been a huge unlock. The big advantage here is that a normal API, direct tool integration or CLI are unpractical to set up for my less technical coworkers.

Other then that I've been building MCP's in pretty much all (personal) tools I'm making now, it's very useful to have a central way for an agent to look at production data without having to ssh into a server.