I don't drink at all, and my husband drinks 1-2 alcoholic drinks a day on vacation. We get the soda package as well. My husband will bring 1-2 bottles of wine onboard to have a glass before dinner (or carry it to the dining room to have with dinner). But he keeps the small bottles of alcohol from the Elite minibar. Then he will order a virgin mocktail (which is included with the soda package) and add in alcohol from the mini bottles. So other than the soda package, we never need to purchase drinks onboard.
I agree with others that being Elite makes it obvious that Plus isn't for us. Between me not drinking alcohol and the discounted wifi, Plus just doesn't work out without some kind of TA promotion.
The laundry is really nice. Every 3-4 days I send out our socks, underwear, t-shirts, etc. It's nice to have clean things rather than a growing pile of stinky clothes! It also helps me pack less on a longer trip. For example, we are going around the British Isles on Regal next month and will be away for nearly 3 weeks. But I'm only packing 1 week's worth of underwear/socks/etc. because we'll be able to get things laundered.
The tender priority is helpful too. We have a lot of tender ports on this same British Isles cruise, and when planning our time ashore, I know that we'll be able to get ashore relatively quickly.