Yes mate, I'm playing it on PC. It's definitely one of the things I like most about playing on PC - it saves hours of frustration. You can even use the keyboard if you're playing with the 360 joypad on PC - the keyboard remains active so you can just jab F5. I quite liked using the joypad to control it, too.
Quicksave is such a handy time (and frustration!) saver I wonder why they don't implement something similar on the 360 through joypad alone. Obviously you wouldn't want to lose a button to it (there probably aren't any left anyway with something like Skyrim) but surely some kind of two-button combination would work - say Y + LB? Or perhaps a d-pad button plus RB?





