Myself, when I tank a dungeon I’m familiar with I almost always pull as many packs as I can in one go. But I stop immediately at the last pack because it’s time for the DPS to get to work and I wouldn’t save time by continuing — we either spend time going to the wall now, or we spend it later, but it’s pretty much the same either way.
More generally though, I treat it as the tank’s prerogative to set the pace and location of battle. When I DPS or heal, I prefer to go along with what the tank does even if I disagree, because cooperating on a mediocre plan usually works better than pushing a good plan that people aren’t on board with.