Like many clerics, mine just looks at the red bars when the heals are flying fast - taking the time to discriminate between those who can heal themselves & those who can't (won't - c'mon, anyone can chug a potion) just increases the odds of someone dying.
On the other hand, when the fight is over & it's time for topping folks off, I tend to give everyone with any self-healing ability (rangers, paladins, WF with wiz or sorc levels, bards & other clerics) a chance to use their own wands before using mine on them. I'd rather spend the money on wands than have to reenter the quest after a party wipe, but I'd also rather let other people spend their money on wands