That is Pat St. John, and he just started last week. I don't mind his voice, but the recapping who just played is a bit annoying. At first it really bothered me, and then I was kind of happy when I would tune it to hear what I just missed

It gave me a feel for the set that was playing and made me want to listen some more. Keep in mind not everone has their radio's in front of them to keep track of who just played.
I noticed Carol Miller doing the recaps too though so maybe they have made a fundamental shift in SJ talk on the Rock.