Ok, this sounds really cool:
"To give you an idea of how convenient Siri is, it takes about three seconds to create a reminder with a voice command, as opposed to the 10 seconds it takes me to manually type an event into a to-do list or calendar entry. . . .
You would think that dictating commands to a phone would look awkward in public, but Apple thought of a trick to make this less weird. By default, if you hold the iPhone up to your ear, Siri is activated, so it looks like you’re talking to someone on the phone rather than talking to the phone itself. Clever, huh?"
http://www.wired.com/reviews/2011/10/iphone4s/
I suspect it'll take a few years to get there, but in principle it sounds like there's no reason why the entire data-input process (get the task wording, stick it into the right project, create a folder for it, set the context, etc.) couldn't be done by simply talking to the phone.
But in the meantime, talking into my phone for 3 seconds to create a reminder sounds pretty good.