I took it to mean that the author is either on or off with such things, and couldn't merely cut down. I'm the same way. One cup of coffee a day is an impossible dream for me, I'd have to totally quit instead.
If you are in an environment where there is decaf coffee I suggest mixing half caf/half decaf. You cannot really taste the decaf and get in half the caffeine, although it's not a real fix, it should help a little :)