Agreed! The cabana is the #1 reason to go concierge! If you want to get one, you pretty much have to be concierge, or a very lucky platinum cruiser. Aside from the appeal of the cabana, I just think the service can't be beat. From the minute you arrive at the terminal, you start enjoying perks - boarding early, private waiting area - and then you are whisked away to the concierge lounge (or now, a concierge lunch) to review your itinerary with a concierge host. The hosts are readily available and eager to help the whole time. And, they are great with the kids! The hosts were always laughing and joking with DD and one of them played Uno with her for close to an hour, just on a whim
Plus, if you are planning on spending any of your $$ on alcohol while on board, you can partake in the 5 hour happy hour in the lounge - a nice little perk if you are like me and DH and like to enjoy a cocktail ... or two or three
The other thing I liked about concierge was how close the lounge was....DD was able to bop over there in the morning and grab a pastry or some fruit from the little buffet they have set up every morning. She loved the independence and we loved knowing that she was just a few doors down and would be back any minute. I think you said DS is 6...so he might be a bit young for that but still being able to grab a light breakfast or lunch in the lounge and then getting back to enjoying your day is a huge selling point for me.
So, yes, I think concierge is worth it...but like others have said, its definitely a personal decision in the end!