Hello, Do I Stand Alone, and welcome to the board!
I understand where you are coming from, and I have considered the question of benefit from the WT in the past, but in all honesty, I don't believe that there was any true benefit, except possibly in gaining firsthand experience of how people can be controlled.
With regard to the possible benefits of gaining confidence in public speaking, I have two things to say about that. First, not many Witnesses actually are good public speakers. Certainly, there are a few standouts, but I think it is more probable that the ones that were good speakers were simply naturally attuned to that. And secondly, even if there were some marginal benefits in this regard, it is possible to find benefits in anything. For example, if your house was run down with a bulldozer, you might be able to look on the bright side and see that at least you were finally going to get a chance to redecorate your bathroom. But surely there were less traumatic ways of getting there!
All in all, I don't think the JW organization offers any positive benefits to its followers. I think the reality is simply that some people are able to derive benefit in spite of the organization.
Just my two (or maybe three) cents. :-) Hope you'll stick around!
SNG