Mostly only drink tea while I'm sick. I drink coffee every day getting up with my wife, but I'd rarely drink it on my own.
A few weeks ago my wife went out of town for a long weekend and I had the most persistent headache that wouldn't go away. When she came back, it went away as soon as I started drinking coffee with her and I realized it was caffeine withdrawal. I hate being physically dependent on coffee, but it's a big part of our morning ritual.