Hey there Ken,
I find that every group has it's own "flavor" depending on the people who attend. What is true for one group will be different a couple years later as the membership changes.
I have made deep and lasting friendships with many people on the program. Some have moved on as work and geography dictated. Others I have managed to keep in touch with. I think a friendship will only last thru time if both people make an effort to nourish it. Left unattended it will wither regardless of where it originated.
One couple I had not seen in some 15 years, and when we accidentaly met at a convention we chit-chatted like there had been no time between us. Ok, he's a little heavier and I'm a little whiter
Mike