I am fully in favor of team "I'm never sending my voice anywhere", but assuming a locally-hosted voice control I'll say: voice is a great interface around the house.

If I'm preparing to leave and wonder whether I should bring a jacket, yelling "what's the weather like?" is much more convenient than taking out my phone (or go pick it up from the other room), unlock it, go to the home screen, open the weather app, wait 2-3 seconds and then scroll to the full forecast.

I'm not saying that checking my phone is an annoyance - it's still much better than checking the newspaper. But being able to keep my uninterrupted focus in what I'm doing is the type of luxury one only notices once it's gone.