Times where I've found myself pleased with my smart watch:

• Keeping discreet timers.
• Discreet taps on the wrist when a delivery is arriving or someone important is trying to call me.
• Quick replying to texts from my SO.
• Pinging my misplaced phone.
• Directions to places via cryptic taps on my wrist (and having a little map if I want to check).
• Remote camera view-finder and shutter button for group photos where everyone can be in them.
• Having a money conversion calculator on my wrist when traveling.
• Audio controls from my wrist. (Really nice if you like walking around without a phone in front of you.)
• Paying through a subway turn-style with a tap from my wrist instead of needing to dig something out of my pockets.
• Keeping track of my health, which I wouldn't have otherwise.
• Less general dependency on my phone itself, resulting in better battery life.

Not saying you should or shouldn't get one. These are just reasons I've found myself happy with mine.