It is absolutely mental and emotional abuse, and I think it goes far beyond shyness or lack of imagination. It has to do with the worldview that all of you worldly friends, teachers, family and neigbors are soon to be destroyed, and YOU will be bloodguilty if you don't speak up.
I think growing up JW is almost like growing up in a war-torn nation. . . . always under constant threat of everything you know being annihilated.