Organize This, Not That
It's an easy and often-ignored chore you can even tackle in a doctor's waiting room—make sure your home screen has only the apps you use daily, with any pre-programmed or long-forgotten icons moved off to the second page of the screen (or better yet: delete them). This alone could save you 150 micro-hassles per day—that's the number of times users check their phones.
Not That: Your email.
In 2011, IBM researchers studied 85,000 instances of looking for old emails, and discovered that the search function is a much more efficient tool than meticulously categorized folders. Consider that official permission to forgive yourself for ignoring the "online shopping receipts" folder you created last year.