Concierge or club level allows you access to a concierge lounge (free snacks & beverages throughout the day), individualized itinerary planning through the concierge staff - this is true at all Disney resorts at concierge level. At AKL, you can also book a safari that is available only to concierge level guests.
Lastly, I believe some of the views are different at AK concierge, but I've read varying things about this and am less sure about the "benefit" there.