May I ask which parts do you find most repetitive in that song ?
Yes you're right, the first vocal part is one minutes of the same melody repeated over and over gain. The second vocal part takes around 2.5 minutes of different melodies.The whole thing? I mean, the vocal lines are repeating the same melodies over and over again.
That being said, it has some sort of hypnotic quality and is miles better than repeating the same words over and over again!