In my book, AR is completely invisible, until you need it:
- A smart watch + strict notification filters (good idea either way), means you only see a notification when something worthy of your attention happens (you get a text, event reminder, etc). You can glance at the notification and decide if it requires your reaction, instead of reaching for your phone. (And likely, waste another 10min on it.)
- Wireless earbuds with turn-by-turn directions, especially for walking and public transport. Again, you don't need a screen, you can admire your surroundings or read a book.
- Pay for stuff. If you'd spend 10s on pulling a card out of your wallet, it saves you an hour of your life per year.
- Track your vitals. Overall not that important, until you notice and suspect something is wrong - you can compare things month over month, see trends, show it to your doctor, etc. I took a hard hit falling off a skateboard, my watch started a countdown to call for help - I stopped it, but I needed a minute to get up, so it was really reassuring to have this.