You cant hide in the bumps.....
I have chased my mogul skiing buddies for years, and I can tell you with certainty that a rockered board makes it a lot easier. I ride a NS Premier F1, and the way it pivots (stealing the term Snowolf used in his Heritage review) in the bumps makes it easier and a hell of a lot less tiring.
I actually prefer a cambered board in the bumps, if you are using fore-aft movements when you push down on that cambered board it gives you way more back to push you into that next turn. I remember 3 years ago when I moved to a burton hero I hated it in the bumps, I love my heritage in the bumps right now though.