[Gogar]

You can do alarm clock stuff, calendar reminders, etc.
Lots of health related stuff; there’s a few ECG apps to see your heart rate over time in a day.
If you have sleep problems you could get an app to monitor your sleep patterns
Answer and make calls, speakerphone, etc.
Talk into your watch just like a sci fi movie
Basically anything your phone can do, without the annoying phone in your hand.