Has anyone actually seen true business lift from agents or is this one of those "do stupid things faster" situation?

I think it's mixed. I have seen people with really good use cases and the opposite. It feels like the AWS/GCP situation all over again. Step 1: "this is amazing tech we need to leverage it immediately, use it as much as you can" Step 2: "oh shit this is getting expensive and I'm not sure of the ROI". We are approaching step 2