I use it because combined with Solar Grenades (for PvE) it melts everything that dares come across it. (Melts Wizards and Cabal like butter).
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Solar grenades do this effectively regardless. You're arguably wasting a perk for little benefit.
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Enemies run away from your Grenades. If they got out at all, they will still die (the reason I say they melt like butter). Besides for me, having two Grenades slows down the cooldown timer too much; so it isn't my personal cup of tea. Also Angel Of Light makes me a floating target, so Touch Of Flame is a better option. I also run Heart Of The Praxic Fire, so I have grenades faster than I can throw them with max Discipline. But hey, it's all a preference to each player.