The Plus is worth it even if you don't drink at all. Here's how it works out:
The Zero Alcohol package is 29.99 a day. Crew Appreciation varies but let's say you are in Balcony or lower, that's 16 a day. If you weren't planning to go to fitness classes, eat the specialty desserts, or get internet, that's $45.99 a day which is less than the Plus package. But if you want internet, that's 60.98 a day which is slightly more than Plus. And with Plus you get a few other things thrown in.
So just get the Plus and drink as little or as much as you want! 😄