Hey healers!

So this topic came up in my static today, as I was confronted with a rather blunt statement that one tank job (Warrior) was "harder to heal" than the other two. I am personally under the impression that the differences aren't that significant, as it comes down to the skill of each individual player behind the job rather than the job alone. But I would love to hear what the healer community thinks about this.

Is one tank job harder to heal than the other? If so, why do you think so?