These intros certainly can be helpful when listening to the story in a serialized form, but I completely agree that when you are listening to them one after the other, it gets old fast. Like if you watch 24 on DVD, every episode starts with "Previously, on 24" to sum up what you just watched.
Since the book has been released in its entirety, perhaps Mur could be persuaded to re-release it without the intros. I honestly wasn't terribly fond of the recaps done by the characters.