That's in interesting question. Paul Harvey was unique and had his own quirky way of working a script but he didn't sound "stiff."
Maybe it isn't the scripting per se that bothers me about NPR, it's the predictability. There's never any passion in the readers' voices ... they just read the copy in a sing-songy tone, the way a parent reads a bedtime story to a child.
Even the interviews on NPR are so, so polite. When an author, for example, is interviewed, the interviewer asks "important" questions in quiet, intimate tones ... then feigns absolute interest in the answer no matter how mundane. When the author says something mildly amusing, the interviewer gives a hearty, "Ha ... ha .......ha ............. ha ....................ha ........................HA!" that's as disingenuous as a three dollar bill. It all sounds very formulaic.
Much of what's on commercial talk radio today is the exact opposite ... all yelling all the time. To me, Savage manages to hit a middle ground, especially in recent months. Sure, his rants are over the top but that's no doubt what got him the necessary attention in the first place. Jerry Doyle is a better example of a host who's smart, spontaneous, opinionated and funny ... qualities that used to be far more common on AM talk stations but, IMO, are absent on NPR.