I always mull over getting a drink package. I could probably break even, especially on sea days, but my DH doesn't drink as many "silly drinks" as I do and we have to pay for both of us.
We had it paid for by my mother-in-law and were worried about the same thing with my wife. I am pretty sure we at least broke even on the package, though. We now plan on paying for our own package on our next sailing (I did end up booking that weeklong cruise on the Breeze, with a stop in Disney World beforehand). A couple things that helped us make the most of her package were the specialty coffees included, as well as the fact that we would each get a smoothie or two for our kids on our cards (technically not allowed, but a couple dollar tip ensured that there was no issue whatsoever). Sitting around the pool, even at 10 in the morning, makes it really tempting to grab an $11 drink if it's included, just for the refreshment. On our cruise, a couple of the dockings did not occur until noon or so, and we had had a drink or two before getting off. Nothing to dull our senses, but it did add to our daily totals.
On sea days, I had mostly $6 beers because I didn't want all the sugar from the foofy drinks, but then I would make up the money difference by ordering $11 scotches before and and after dinner.