Julia i feel each time i have left an organisation the friendships have with time faded, be it school, work, or the witnesses.
I accept association in the witnesses was largely based on acceptance to dogma and witness activity. As for friendships surviving without that association, i am not disfellowshipped, but marked and not good assocition. As for feelings of friendship, yes i think on both sides ( mine and theres) these have survived.I call my witness friends who tradesman if i need a plummer or windows cleaned and we get on just fine and the subject of religion is avoided.
I think friendships based on a commom interest will grow apart if that common interest is in conflict. I am pleased that in many cases the friendships i have had have been proven stronget than W.T association. These positive cases have not been with any of the elders.