- "add milk to grocery list" — I have a reminder list called "Grocery" to make that happen. Makes it easy to add stuff as I realize I'm running low, then I can check it off in the Reminders app.
- "create appointment next {day} at {time} {title}" — I never use that one when I'm next to my computer, but when I'm around the house or after a doctor visit, it's usually accurate.
- "what time is it" — no I don't wear a watch. But when I'm hiking and I'm too lazy to pull my phone out, this comes in handy as it works though most pockets.
- "send text message to {person}", "call {person}" — when driving, that's a pretty seamless way to convey quick messages without touching the phone.
- "get directions to {place}" — I only use that for locations I know the phone will understand, like favorites or business names that are not ambiguous.