Well, I never quit and I don't raid so I couldn't really come back, but a week after firelands I started doing the Molten Front dailies (I'd been putting them off and playing TF2 instead
) and I've been playing a lot since. I got a tad burned out after doing so much in the way of mount farming to get 100/100 mounts, and I needed a break. The Molten Front dailies made me start playing more, and finish that achievement.
Though, as I said, I always had an active subscription so does it count or not?