As already mentioned, paladins have been able to troll the tank with that for ages.
Personally I like things like this to spice up the heroics I run with friends for valour. Back in Wotlk we'd try and make them a challenge to spice things up by doing things like BoPing the tank, healer won't dispel anything / not use things like watershield etc.
You know, for a kitten that shits rainbows, you seem to like to stay inside the box.
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Also we're talking about a PVE setting, not PVP where a lot more people will notice every scrolling text + animations on toons. More important in PVP than PVE imo since you need to watch what your opponent is doing and what colour/stance/shit glowing above his head in order to counter them.
Spam casting Light of Dawn with the DM healer trinket or Ai-Li's Skymirror will still be the ultimate holy pally troll mechanism. Thats what needs to be fixed, not our 4 piece.