I'm not familiar with Whispering Bill, but I don't follow the Opry and some of the old-time singers very closely. However, I did get there in 2007 and saw Little Jimmy Dickens. He was funny--stood on a stool to sing, talked about his Pepto Bismol colored suit, etc.
I like how you get to see so many acts at the Opry--some old timers, some new--and they cycle them so you get to hear quite a few songs out of all of them. Great time.