I relate to what ScooterScott44 said. We've done 8
DCL cruises. Half of those were Concierge. We have three more booked (well, five, but some are B2B), two in Concierge and one in a regular verandah.
We sail Concierge to gain access to a 1BR suite but we do not mind alternating with a Family Deluxe regular room if such a cabin is not available or if the price for it is crazy high. For example, we would never sail Concierge in Europe or in a Concierge Family Deluxe. We have a tendency to lounge in the room and on our verandah a lot, so we enjoy the extra space. We do not really need pampering from the hosts and make very little use of the extra attention they offer, but it is nice to have it when it is available.
We never feel the need to "get the most out of it" to justify the cost. I guess that has a lot to do with our capacity to afford it... If you believe you would do so considering the price asked, I would suggest not to make the jump. I feel it would take away from the relaxation and enjoyment of the cruise. 95 % of your experience will be the same, without the added pressure. If you can afford it and find going about planning a cruise a bit of a chore, make the jump. They can really help make everything a bit easier if you let them.
As I wrote in another thread, sailing Concierge on DCL is like flying First class. The flight takes the same time, the destination is the same, but the total experience is just a bit different. Is it worth the extra $ ? That's entierly up to you.
My answer would be different on another cruise line. On NCL and Celebrity, upgrading to Concierge can change the cruise experience completly. We just did a cruise in the Haven on NCL Bliss. If we wanted to, we could have stayed in the secluded area for the entire cruise. It has a private pool, sundeck with cabanas and hot tubs, a massive two story observation lounge, a restaurant, a full bar.