I own an Watch because of work and workouts. I work on a printing press that is 70 feet in length and am the manager of the company, so I'm required to deal with sales reps and provide tech support for my company staff. I can not be carrying a phone around everywhere as I would risk it getting damaged. My watch provides me with the opportunity to leave my iPhone in a drawer and deal with messages, phone calls and emails while overseeing the shop. Fantastic tool for notifying me.
I also use it for my workouts. I go to the gym at least 4 times a week minimum. My watch allows me to track my workouts and provides me with great feedback on how I am doing over a weekly, monthly or yearly period. I also use it for Apple Pay, which is so handy. Believe me, I was not the first person in line to buy one and honestly never had any intention to buy one, until a friend of mine showed me some of the advantages of owning one. To this day I can not thank her enough. It has become a very important tool in my everyday life.
These are just my opinions. Thanks!