Last summer while I was working on my PPL at ERAU, my flight instructor, two others, and myself got stuck in Gainesville, FL
for several hours while waiting for weather to pass. He took us over to the Gainesville FSS, and they happily showed us around and showed us the operation and explained the many different work stations and the purpose of each.
We saw one guy have a conversation with a business jet who was being vectored all over the place, and in the least direct method, becuase of the summertime weather. They called up to ask what might be the best way around the weather. It was neat to see that.
I must say it was definitely a good experience, especially when working on the PPL. I guess it really let me see that the people on the other side of the radio are really human beings, since up to then I had a slight case of mike fright, for fear that the big ATC controllers and FSS's and their almighty powers would do something evil to me if I were to screw up. That really helped me realize that they are really just there to help you along your way.
Since then I am very comfortable with talking over the radios, sometimes being conversationalistic when the controllers aren't busy. The controllers, I'm sure everywhere, but at least here in Daytona can definitly have a good time on the radios when they are able, but also serious when the workload is high, and I feel that makes me especially comfortable.
It was a very good experience, and something I would recommend to anyone who hasn't visited a place like that before. It at least is a very good idea to take student pilots to see a facility so they have some idea of who they are in contact with.