One important note is that your throat gets tired talking, just like your hands do typing.

I think it is an issue of convenience. Anecdotal evidence, I have never had trouble doing either of those for 8 hours straight (and more).

Voice will need some serious software support if it is going to take off. There is zero chance that users will learn those mnemonics, just as now almost nobody knows how to touch type. The usage will be more in the form of general commands, than specifying every action like we do it now with the keyboard+mouse.