I started drinking coffee in college - I needed a routine of some kind to help me out of bed and I made myself addicted to coffee to that end.
For the following 20-some years, I drank coffee from the moment I woke up to the moment I went to bed. Pots and pots and pots.
Then, last year, I realized I didn't finish half my cup most of the time, so I decreased my intake quite radically - two cups in the morning, max. Tea the rest of the day. Exceptionally, I'd sometimes have a cup after dinner.
Immediately, my energy level became a lot more even throughout the day. No more crashing at random intervals...
As of one month ago (a month tomorrow, actually), I finally lost all taste for coffee. One morning I didn't even finish that first cup. The next morning, I made breakfast and then had tea. It used to be that I couldn't possibly exist before that first sip of coffee, much less eat or function...
It wasn't a decision - I just lost my taste for coffee. Tea is just much "fresher". And my energy levels are even better than they were.