Yeah born-in here as well and there are alot of things that I have to "unlearn" now as an adult. Ultimately, it was not wanting to raise my kids in the religion that made me leave.
However, I can think of some positives:
I went to alot of social events and always had stuff to do with family and other JWs/ I have fond memories of picnics, beach days, camping, theme parks, parties, trips,etc. I do miss that community sometimes and I probably stayed around longer for this reason.
I learned from a very young age to defend my beliefs (yes, they were totally wrong beliefs) but, in my own personal case, I think it made me a person who doesn't mind being being different. Growing up a JW forced me to be different in all scenarios and I kind of got used to that and learned to be ok with it. I'm very comfortable being the outlier - this would really help when i left the religion.
I was exposed to people of many different backgrounds/cultures/races. I've met JWs from all around the world of all different kinds of social status. I preached in areas that were extremely poor and I got to see poverty up close. I grew up not taking simple things like "drinking water" for granted.