For me, it's swipe right to search. My most used apps are on my first home screen, and I used to be able to just zip back there with a few quick thumb zips. Now zipping right dumps me into search, and I have to do a left swipe to get to where I need to be. My iPodT5 is "too old" to have this horrible "feature," thank Jobs. I wish there was a way to turn it off on my newer iOS devices. What's your personal iOS9 peeve?