Lengthy Child's have their place JD? and here was I about to launch into all 14 minutes of Famous Flower of Serving Men!!! :-P
It's also about making the music more accessible and sessions more relaxed - one thing that does happen in my Globe session and John Dun's Old Farm Inn is friendly banter and talking between songs as well as gentle encouragement from the session leader. it relaxes people, makes them feel included and also gives people a chance to find out the names of songs that people have played so then they can go and explore that song further or discover new ones that they can then do.
I feel it is crucial to make younger people feel welcome in sessions and nurture that, all the best players/singers started as young people with an ear for folk so we need to not lose out on a generation of people who are out there and perhaps put off by misinformation and assumed snobbery about the scene.