I would struggle without my Apple Watch now.
I had the first gen but gave it away as there wasn't enough features for me, but now on my new 2nd gen, it is so much more functional.
I use it everyday to track my workouts, it unlocks my Mac(s), it sends me authentication approvals when using two-factor authentication for sites like Microsoft, I share my workouts with my brother, I sometimes take phone calls when my iPhone is upstairs, I can actually send text and Whatsapp messages using the excellent scribble feature. When I go to the airport, my boarding pass is on my wrist.
I find I use my iPhone for Apple Pay, but then I have my phone out anyway to scan items which then upload to the self-service machines using the Waitrose app.