Or (android example)...

Physical:

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  1. Find phone (Is this really an issue? Haven't they become an extension of our body?)
  2. Unlock phone with thumb (unless of course you're already using it).
  3. Type "make a note to do the thing" into the big text box at the top of your screen.
  4. Preview / confirm it's what you wanted.
  5. Hit "Checkbox" to confirm.

By Voice:

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  1. No need to find the phone (assuming it close, which I'd say is a fair assumption).
  2. Say "OK Google".
  3. Say "Make a note to do the thing".
  4. Depending on current coverage, wait while it goes to the cloud to figure out what you mean (annoying).
  5. Listen while it tells you what it did.
  6. Say "Yes" to confirm.

My point is that the equivalent workflow exists via typed text. The workflow itself is not coupled to voice.

That being said, I do agree that it's very convenient to use voice for these sorts of tasks. Especially when driving.