We like being certain that we will get every excursion, spa appointment, specialty dining reservation, and a cabana on CC without question. We also like having easy access to the concierge staff to make changes to reservations on board quickly and easily. The snacks and drinks in the lounge are convenient and a favorite of our kids. With 5 people, we also need either the space of the suite or two staterooms, so the suite is a good option for us. And given our inability to predict when we will show up at port, the special boarding area helps, too.
We also only vacation once a year due to career demands, so we tend to maximize that one trip.