How many times did we sing "Nah, Nah, Nah Nanana Nah .... " at the end of Hey Jude? 2 or 3 minutes, I think !
From a creative point of view, it may seem redundant, but from a marketing view .... the crowd really seems to latch on and sing along to mindless repeats. Think of the "Sha la la's" in Brown Eyed Girl, or the Chorus for "Old TIme R&R" ..... the entire room is usually singing those parts.

Right or wrong, creative or boring ..... it doesn't seem to matter. The layman appreciates something that they can identify with. Maybe that's the whole secret to the success of R&R over the years. It's music for the people, not for musicians. We can all master those few chord changes right away, but it's the energy and "crowd appeal" that make it work.

If you want to make money - play the hits. (over, and over, and over)
If you want to make a statement - write your own stuff and play it to any audience you can find!

Many of us find a nice balance between the two in our nightly endeavors. I don't love every sond I sing, but I DO love it when the song goes over well.

So, keep on singing those repetitive phrases and watch the faces of your audiences. It just might give you the "spark" you need to appreciate the beauty in redundancy...... again !