"is it worth it?" is very subjective. I have had access to Coco Beach Club in the past, I would consider it worth it at that price myself. That said, this was before the all adults area opened, I would be inclined to check that out. Hideaway Beach was mentioned above..
This thread reminds me that I need to book a Celebrity Cruise with Coco Cay on the itinerary. Preferably one that doesn't share the day with an Oasis Class 🙂