^^ It's easy, but does take some planning, you guys were driven there by a friend. Taxis are an option, but you are looking at about 3 hours total travel time for the round trip, and probably close to $300. Now, a coaster fanatic would pay that for a ride on the world's fastest coaster, and I was prepared to. But few tourists would do the same. Plus, I know I wasn't really sure about getting into a taxi with someone who spoke little English, and getting them to drive 80 miles for me. Some of the taxi drivers I had, it would have been fine. Some of them, no way in hell would I have asked them to do that.
Dubai is definitely the hub airport in the area, not Abu Dhabi. And all the other things, Atlantis, Ski Dubai, Wild Wadi, Burj Khalifa, world's largest malls, are all in Dubai, not Abu Dhabi. Plus, Dubai has a transit system to take you to everything.
Ferrari World is very out of the way right now. Hopefully that will change. It has to, or FW won't be around. No matter how much money they have, when I visited, workers may have outnumbered guests. That isn't a profitable venture.