Don't forget that async is "viral": if you call an async function and need to do something with its result, the calling function must in turn be async for await to work inside it. So the moment you start doing some async I/O at the bottom of some call stack, the entire stack becomes "infected" by async, and needs have awaits inserted in every frame.

And it so happens that I work on the kind of products where a lot of useful work revolves around I/O: IDEs.