This is a great example of "it's not my preferred mode, so it must not be anyone else's."

Dictation is widely used in medical transcription.

Dictation is a killer way to write a first draft quickly, transcribe rough written notes after a meeting, etc. Also, about half of my emails are dictated, and I know I'm not the only one. It takes some time to get used to, but once you're there (like touch typing!), you can't go back.

..etc..