Prepare to judge, but I quit coffee cold turkey almost two months ago. It was one of the best decisions I've ever made. I was routinely drinking four+ cups a day - sometimes up to ten, if it was really brutal - and felt run down constantly. I needed it just to be functional, and on the rare occasions I needed to work the graveyard shift, I had to turn to Red Bull or the like to power through. I'm an all-or-nothing guy, so I just stopped with caffeine. Herbal tea all the way, man.
I'm shifting my sleep schedule to do a week's worth of nights, and I had a cup of coffee at 0200 this morning. It's six hours later and I'm still energetic and feeling okay (although the eyes, they are starting to get heavy). Caffeine actually has an effect on me now, which is bloody awesome.
Tl;dr - caffeine was a crutch for me, and now is a useful tool on the rare occasions I truly need it.