Absolutely! For 10 cruises you obtain Platinum VIP status. No waiting in line for check in or pursers desk. Priority tender service and debarkation. Cabin decorations, gifts, and special treats and desserts sent to your cabin. Guaranteed reservations for the Supper Club, and free laundry service.
There is probably more, I just can't find the link at the time. LHP, may see this and chime in, she is a Carnival VIP for sure.
I like the check in the best. They take you to an office to check in, and then are escorted to the front of the line area with chairs