I use it for follows ups and scheduled tasks, and combine it with my calendar by using Fantastical 2. Of course if anything requires more of a breakout of detail I would keep more info in something like OneNote etc.
So if someone needs something from me, or I know I need to do something, I'll just use 'hey Siri' on my watch. Or I'll setup repeating reminders for things like taxes, chores, etc. I'm a little Type A! But I don't like dropping the ball with clients....
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Me too - Reminders (via Fantastical) and Calculator are my most used phone apps!