Its difficult playing both sides of the fence, especially when you don't see a happy ending regardless of what side you choose.
It is difficult. Impossible for some to sacrifice personal integrity for the sake of the group. I couldn't do it for very long. It was making me ill until circumstances forced the issue for me. Just how long I'd have tried to actively fade and just how sick I'd have become is hard to say. What I will say is that not seeing "a happy ending regardless of what side you choose" is just a perception; it isn't correct. There is happiness (in the sense of fulfillment and contentment, if not downright joy) in freedom.
Like Leaving said, it is the difference between freedom and slavery. Have you read the Autobiography of Frederick Douglass?
http://sunsite.berkeley.edu/Literature/Douglass/Autobiography/
I don't claim that JWs have it as bad as African American slaves of the 18th and 19th centuries but when you read about how he treasures his education and his freedom there's a definite empathy there.
I have to admit though, that DeeDub's feeling of happiness from being part of a congregation, is something that I can relate to. Its hard being angry and disgruntled at the end of a meeting when everyone is laughing, smiling and generally enjoying one another's company.
This is by design. The before and after-meeting fellowship er, association ritual is designed to build and reinforce belonging (one of the "three B's" of religious socialization). The article "Behavior, Belonging, and Belief: A Theory of Ritual Practice" by Douglas Marshall is pretty good at laying out how religious rituals function. It isn't unique to JWs and it isn't any sort of indicator of JWs having "the truth" because of "love among themselves." ALL religious groups do this, even "worldly" ones.
It is great that people can find some joy and camaraderie with their friends.
That is no reflection on whether the group of friends all belong to a dangerous mind control cult.
Only the individual member can decide for himself or herself whether remaining in is what he or she will do. But very often, the decision to remain in is accompanied by delusions about what is really going on both personally and within the group.