Overall it was more negative to my social development. I have to admit to several things though. I believe I'm naturally more inclined to be a recluse anyways, but the environment I grew up in just exacerbated my isolation. I grew up in a religiously divided house for the longest time (till my Catholic mom finally relented to my hard core Dub father).
So I was going to Catholic school but still being made to live as a JW. Because of that I was never accepted by the true-believer dubs (only tolerated), I wasn't cool enough for the teen dubs living double lives (they avoided me like the plague) and just forget about the guys and the gals at school. Being an outsider in all worlds stunted my making real friendships, going through all the ups and downs of trying to strike up relationships (intimate or otherwise).
I did have a fairly close non jw school friend in grade school so that tells me I'm not unibomber material and there was some hope for me. Some people only have a closer smaller circle of friends. But the stupid pushing from my Dad to "preach" messed things up so that by middle school with larger classes and other kids, he moved on but I just got further isolated.
As for intimacy with the opposite sex, all attempts at relationships floundered because of not having the freedom to interact with them on our own mutually agreed upon terms. It had to be chaperoned and "acceptable" activities. It was completely artificial and I learned nothing. Mind you I'll also be objective and say that my parents were a horrible match and should never have stayed married so that dysfunction also was a huge deficiency for me because I had no model for how to positively relate to the opposite sex . But then thats why I really could have benefited from the more typical dating scene.
Maybe I really should consider therapy. But this board is free.
One positive thing about the witness upbringing: Its taught me the importance of NOT going down the same mistaken path most of them take: i.e. I should fight my (also natural) tendency to ignore inconvenient truths rather than stick my head in the sand.