Regarding this, that particular policy is yet another reason I can't go to Adventureland anymore. If they get a good new ride, I will consider it, but working there honestly put me off that park for a long, long time.
It's my opinion that it is always a bad idea to take any loose article on any ride ever. Period. I don't care how sturdy you think your grip is, you have no idea what's going to happen on that ride, even if you've ridden it a hundred times. If something were to happen and you were to loose your grip on your camera, it pretty much becomes a huge bullet. That is not a risk anyone should ever take. Especially enthusiasts. We should know better.