Depends on the class. High-tier Bards want megapulls due to the nature of our song rotations, since we'll want to be in Army's Paeon at the start of the megapull to give the tank physical troubadour (along with throwing DoTs faster), and then swap over to Mage's Ballad to cram in as many free Rain of Death resets as possible. Our AoE outside of the 30 second Mage's Ballad window currently sinks like a rock, and pulling small packs at a time means we'll likely have to dip into Wanderer's Minuet... Which also means Wanderer's Minuet might not be available at the start of the following boss fight.
So yes, it is a resource drain for Bards, just in a different way.