I've thought about this one a while...
I can only think of one thing...they made me a reader at the age of 3 and half, four. I guess in some respects they gave me a love of footnotes and even if I realize now it was a pretend kind of scholarship it did excite me. I don't know that I can say for certain I would or wouldn't have developed that love of study with or without the JW's.
Being JW's probably saved my parents from getting divorced. How they ended up together sometimes I wonder. While I think they love each other now their relationship had it's rocky patches, including the death of a child, that I think would have broken up most couples who were on such different footing early in their relationship. I don't think they've had a miserable married life. I think they make each other happy now - but I sometimes wonder if either of them would have thrown in the towel if not for the JW's...hard to say really if it's doctrinal, or generational.
For me I can't see it that black and white that my life would have been drastically different had I not been raised a JW. More than likely we would have been raised crazy catholics. I'd maybe have more brothers and sisters...my parents were looking for something spiritual and it just so happens the JW's came knocking first. Hell, I might even be an ex-mormon by now...who can know?
I guess that's why I find it so surprising so many on this thread know for a fact that if not for this one factor in their lives they'd have happy well adjusted lives. I guess for me my life isn't that simple - and I couldn't tie my happiness to one factor. Too many layers for me to make that call...I think we get a little bit whistful in the "If Only"...for me personally I don't see that kind of gurantee. My mother and I probably still would have fought like cats. She'd still be depressed, which would have translated into my own depression. I still wouldn't have been allowed to do many social things, and probably wouldn't have wanted to...I'm pretty sure with or without the JW's I'd have been a chubby nerdy teen. Hell being a JW ensured I had to at least have some friends if nothing else.