Sorry- I realize you want negative answers- but the truth is- I learned to speak and read Spanish, I learned to speak and read Russian and I learned to speak to an audience. (Had to learn that last one over after I left and wasnt giving speeches based on canned religious statements learned since I could talk and to audiences who would actually listen and question everything I said.)
I also learned unquestioning obedience, that I am a terrible person, that I should feel guilty about everything, that I wasnt doing enough, that I wasnt working hard enough, that I should not use logic when examining the teachings of the WT, that asking questions was a sign of disloyalty, that I should fear being caught, that I was part of a group that was intrinsically better than everyone else on earth, that I should give up my dreams now because the New System will be sooooo great, (I could go on...)
Unlearning the second half took a few years. Probably still a work in progress.