I'm pretty sure it goes all the way down to CS2 and is in PSE 10 for sure - I can't scrap unless I can see my elements in the preview thing. It's one of the first things I figured out when I switched to Photoshop from my old, old program. It's an awesome trick!!
I have that - and I always make it so that I zoom in with the scroll wheel on my mouse. Oh and I changed my short cut keys so that my "back-up" is Ctrl+Z instead of ... I think it was Ctrl+Shift+Z. That way I can keep clicking Ctrl+Z until I get back to the step that I want. Those are the few things I can think of that I've changed. Oh I also have my history pallet thing save way more steps than what it normally saves. Like 200 or more I think. Sometimes I need to back up more than a couple steps - and the default is something small like 25 steps. That doesn't work for me - especially if I'm editing photos
All of those are in preferences (I'm pretty sure). I'm not on my main computer right now - so I can't check