Actually, the unlimited brewed coffee, tea & hot chocolate is ONLY on the original cruise. The 15 specialty coffees will carry over until they are used. When you get on your second cruise, you can use those "punches" (like the old card) for brewed coffee, tea or hot chocolate if you choose.
I always bought the card, but I don't like the foo-foo coffees. I just drink a lot of brewed coffee. I would do that and it worked out great for me.