Yes, there were some very interesting chats and very often no mention by the guest of any book or movie. Parkinson was good with men but very leery with attractive women. He was obviously a boobs man and would get all silly and giggly with people like Rachel Welch and Helen Mirren, it was pathetic. Wogan on the other hand was never fazed by a pair of boobs. He coped with anything, rudeness, cheekiness, whatever they did, he stayed professional. He was wonderful.
Graham Norton is very good at coping with anything, but his show is very shallow and has no substance. It's all about the latest book or movie.
Two people who can give a really good interview are Piers Morgan and Jonathan Ross. I've seen both of them interviewing people at length, but it doesn't happen very often.