The icons on the notification bar indicating current time on call, and if your mic and cam are being accessed. There really is so much more that is software experience based that is taken for granted. I feel too much focus is given to cameras when a device is released.
One thing I still can't say I like are the big blocks on the notification bar when pulled down and the way you have to go into internet and click on wifi to toggle on/off. I prefer the old look and functionality. These are minor grievances though.