The "ping your Watch" button is crazy useful. When I'm out and about my phone is always in my pocket (or in my hand, or on the MagSafe car mount), but I have a bad habit of walking in the door and setting my phone down in like one of ten different places, so I just ping it with my Watch.
You can also ask Siri to ping your phone, say if you're using HomePods, but this has an annoying habit of sending a notification to every device to tell you that you pinged your phone, and then it also sends email in case I missed all the notifications. 🙄 Like, Yes, Siri, I'm right here, 15 feet away from you and 15 feet away from my phone - I didn't need you to alert the media.
Also, the article described the wrist flick to dismiss things (quite useful), but not the deal where you can tap your thumb and a finger together twice to cycle through options (by default, showing the smart stack).