Its actually a pretty good cooldown. Your cure I will drop from 2 secs to about 1.5 which when your are trying to keep up two tanks or need to squeeze in a heal to a dps or yourself during high tank damage phases is pretty awesome. stacked with divine seal it can be a great way to recover if you get behind. I wouldn't mind seeing the duration stretched a bit further because of the 5 min cd (maybe 15 secs to match with divine seal) but its super useful both when your are working on hard content and for when you are stance dancing to get in some extra deeps.