I was addicted to coffee the same way - averaging 5-7 cups a day with the random shot of espresso here and there. Couple weeks ago I dropped down to 1 cup a day and I've stuck with it. I feel better because of it and the afternoon crash doesn't come anymore.

The few times I craved coffee in the afternoon I've replaced it with some kind of tea (what ever I have on hand in Keurig form or from Starbucks) - It's helped.