I recently created a week-long IT training course with an AI. It got almost all of it right, only hallucinating when it came to details I had to fix. But it took a task that would have taken me a couple months to a couple weeks. So for specific applications it is actually quite useful. (Because it's basically rephrasing what a bunch of people wrote on Reddit.)
For this use case I would call it as revolutionary as desktop publishing. Desktop publishing allowed people to produce in a couple days what it would have taken a team of designers and copy editors to do in a couple weeks.
Everything else I've used it for it's been pretty terrible at, especially diagnosing issues. This is due particularly to the fact that it will just make shit up if it doesn't know, so if you also don't know you can't just trust it and end up doing research and experimentation yourself.