One recent change to Trusty that I am very, very grateful for is the popup when you press the printscreen button. It asks if you want to save the screenie.
Before I would accidentally hit that button several times a day because it is very close to the backspace button on my keyboard.
I would wind up with a bunch of unwanted screenies in my downloads folder that I would then have to cull.
Pretty sure I am not the only one that likes this change.