Most Shiurim are given in ENGLISH not Yiddish, I supposed if you rarely venture out of such places like williamsburg you would not realize this, but most are in english. Most jews speak english (probably more than even Hebrew).
And I dont have hate for people who speak yiddish, My mother spoke it first (I dont know if she speaks it anymore as I dont think she has spoken it much in a real long time) and I never really figured out if my father speaks it or not.