to be fair i have played a holy pally trough burning crusade and up until i have never asked for an inervate in my life
if you are a bit reasonably geared and you need an inervate as a holy pally go jump of a cliff
put beacon of light on yourself and hit the boss a few times with seal of wisdom up for 1k mana per hit
if you need to bother a druid for mana jump of a cliff and learn to play your class