Our drink of choice is gin on the rocks and our go to gins are Tanqueray and Bombay Sapphire. We each usually have a maximum of 2 doubles before dinner, so at $11/single x 1.2 (20% gratuity), our daily bar bill is typically $52.80, each. Even if we were to go with Henricks as a splurge ($14 x 1.2 = 16.80), our 2 doubles would be $67.20 per day. Neither would exceed the premium Package cost of $69.95 per day. Since we typically go to Happy Hour and enjoy the Captain's and Return Guests parties, we don't even come close and can enjoy a beer and a glass of wine with lunch/dinner without going into package territory.
OK, we're cheap dates, but the point is that it depends on how much you drink and what the costs of your drinks are as to whether the premium package makes sense. And for us, no package makes sense.
Other than not having a bar bill on you onboard account which is automatically charged to your account at the end of the cruise, I don't really see the convenience factor as particularly advantages, since you have to give them you card to sign or, if you have a package, to register your stateroom number (at least they are supposed to do that to get their gratuity credit).