Of course repetition is more enjoyable to the ear nowadays as it allows people to anticipate what will come next in a song. Its the reason why pop and country are so hugely more popular than jazz. Repetition goes all the way back to chants of early man around the campfire. It cause emotions to build whether they be sadness, anger or the feeling of courage before a battle. It allows the brain to be a part of the song rather than surprised by it. Repetition is a straight flight to the destination rather than a bunch of stops and starts which is the essential difference between pop and jazz or even somewhat classical music. And lets face it, almost everyone in our current day and age would rather get to where their going quickly rather then keep stopping over and over again in my Be Humble opinion.