In all seriousness, the repetition is largely meant for the newbies. Churches have had some criticism over the years of people deciding to attend church, only to be unfamiliar with the songs while the regular attendees were expressive in their singing. Even with a hymnal (which a lot of people have trouble reading) it can be tough for someone visiting church. People visiting felt like they were on the outside looking in.
I have also heard the following:
We have to sing these songs because that is what the people who are not coming (and never came) want.
While we repeat lines seven or eight times, there are churches that repeat them more times than that.
God likes hearing the same line over and over.
Your music likes are just preferences. (I guess the worship leaders preferences are ordained by God).
“Well - you grew up in the Lutheran church right? Remember how you did all of the repetitious chanting during one part of the service? That repetition is a form of worship. Recall in Revelation how the four creatures say “Holy, Holy, Holy is the Lord God, the Almighty who was and who is and who is to come” ALL the time - 24/7.
Well, we don't have the chanting in church - so the repetition is in the praise songs. Praising God!”
He went on to say to use it as a way to focus on God. Each time it repeats think of a different attribute of God, or what God has done, etc.