Setview still works. It's mostly a matter of configuring a view angle and distance where the slaves will roughly match what you're doing on the master.

For example, my hunter's view would be scrolled all the way out and from a higher angle than my tank. My Enhancement shaman's view is scrolled out a little less, but a more pronounced angle so that she's targetting the ground and not the back of my head.

At either rate, it should give an angle and distance that puts my tank in the center of their screen. IT doesn't need to be 100% accurate, targetted spells have a pretty large area of coverage.