I pitched professionally, this does not happen. Guys may see better pitches, i.e., more straight stuff and less nibbling at the corners, due to situational things in a game. Base open, lefty/righty combo, etc. Guys never see better or worse pitches because Mr. Stud is on deck. Giving the guy at bat a better chance to do damage or get on because of the guy on deck is a sure way to get beat.
Even Mr. Stud, when pitched to effectively, can be an out 6 out of 10 times. The odds dictate you pitch to each batter in an effort to get them out.