I use it for
- Checking the time.
- Strava start/stop for commuter rides when I'm wearing the watch. I don't wear it for true sports activities.
- Paying for stuff at the grocery with Apple Pay. _awesome_
- Checking in on Swarm.
- Reading text messages as they come in, and quick pre-set responses.
- Composing text messages via Siri when I'm in a quiet room.
That's pretty much it. I like being able to tell time without pulling my phone out, receiving glanceable notifications that I deem important, and being able to initiate specific, simple, actions (Strava start/stop, Swarm checkins) from my wrist.
In the end, I suspect all I really care about is checking the time and I'll probably go buy a regular old analog watch now that those are back in style.