I use it as a safety step and a bit of a roll call for when we're loading in. In combat, too, it's another redundant reminder if a DD is taking damage as the ranged ones usually aren't in my field of vision. It's especially useful to me in T7. When I see the icon next to the OT disappear (as I hawkishly watch the lifebars) I know s/he picked up the adds.

So safety, fight mechanics redundancy, roll call, and when Thrill of Battle is popped it's a nice extra emergency measure. As a WHM when most of anything you do is reactive, it's nice to have something that can help prepare you and to monitor your party members.

As much as an AoE version would be nice, I think that might traipse on SCH's unique abilities a bit too much. Unless future and higher level content would be made in such a way that damage is unpredictable or you need to hit the emergency OH CHEESE button I just don't see a need for the old "Divine Prism+Stoneskin" before King pops up, heh.