My favourite new feature of iOS9 is probably one of the smallest, but I'm so glad you finally (it's been a long, long time coming) completely disable vibrate throughout the entire phone. I used to hate how you couldn't disable the vibrate that occurs when you plug or dock the phone. I have a clock radio that plays your music as an alarm and also has a sleep function (plays music for a specified time while you fall asleep). Both of these functions have been rendered totally useless by the iPhone as when using the sleep timer, I would be woken up by the loud vibrate when the dock switched to standby mode and the phone started charging again, and likewise with the alarm function, when the alarm triggers instead of being woken up gently by my music I was woken harshly by the loud vibrate! So glad they finally fixed this.