When I first got into raiding, it was just a casual thing. One night a week for a couple hours. Then, when Icecrown Citadel opened, it got far more serious. I was raiding several nights a week, several hours a night. I was grinding hard modes, wiping on heroic Lich King more times than I'd care to remember.
But something changed. That something: patch 4.3. The advent of the Raid Finder tool made it possible to get a group whenever I wanted. I could raid on my own schedule. I could have a life again. Sure, it's harder to get loot via Raid Finder, but I don't care about that. I'm just in it for the fun.
How about you? Has the Raid Finder changed the way you raid? Has it freed up more of your time? Or are you just as serious about raiding as you were before the Raid Finder came along?