Meanwhile, engineers are using it for code completion and as a Google search alternative.
I don't see much difference here at all, the only habit to change is learning to trust an AI solution as much as a Stack Overflow answer. Though the benefit of SO is each comment is timestamped and there are alternative takes, corrections, caveats in the comments.
That's a pretty big benefit, considering the feedback was by people presumably with relevant expertise/experience to contribute (in the pre-LLM before-time).
Yep, that's the usefulness right now.
I've had to switch it off for periods to maintain flow.
I don't understand what this has to do with AI adoption at MS (and Google/AWS, while we're at it) being management-driven.