You have obviously never been to CP with a bad narrator. While there is much more than the narration, a poor narrator really casts a pall over the entire experience. I recall Jaci Velazquez' "valley girl" version 2 years ago which was, like, totally distracting, ya' know? Or the completely disrespectful attitude of Mario Lopez last year when he was text messaging on stage while the choir was singing. Things like this do have a negative impact on the show.
That said, I was fortunate to enjoy Mr. Harris' narration last December. Since he and Mr. O'Hurley were invited back again this year I think both will give excellent voice to the meaningful narration of this show.