I've been using this to diagram state machines while talking about complex UI/state flows at work and people are amazed at how quick and efficient it is as a real time presentation tool.
I hate most of the color themes, but the tool is pretty good and chatGPT understands the syntax so you can have some constructive diagramming conversations with the robots.
Yup. In fact, one of the first wow moments for me when using multimodal ChatGPT was snapping a picture of an old diagram that I had written in faded pencil and asking GPT to convert it to mermaid syntax which it did flawlessly.