I’d like to use my Apple Watch when I go for a walk to record my workout. There are a lot of exercise functions. Also there are some banking apps that work with voiceover on the Apple Watch. Also if you have an Apple TV set top box, you can use the Apple Watch as a remote control and change the channel or movies that you were watching. I have missed placed my Apple TV remote but I did not have to worry, because the Apple Watch remote app works very fluidly across all devices. I also use my Apple Watch to unlock my MacBook computer.

AppleVis has a directory of accessible Apple Watch apps. It would be a shame to use it just for telling the time when it can do so much more.

I use my Apple Watch for time (obviously), reminders is a good build in app, alarms, MLB if you like baseball, the calculator is good, I use it for messages and phone calls, I use the weather app a lot.
I use a lot of the built in apps. The only downloaded apps I use are MLB, and Streaks (which is like a daily tracker). But the Streaks app can sometimes be tricky with Voiceover.