Totally agree. I'm also a shift worker (10:30pm-6:30am), and here is the difference 4.3 made in my WoW experience:

pre-4.3: Wake up about five hours earlier than normal on a work night in order to be ready for guild's raid times, be ready to raid, get replaced at the last moment every time... never get to actually raid, but still get to work a full shift on about three hours of sleep twice a week (not pleasant -_-) as a result of empty promises.

post-4.3: Bored at 3am ("afternoon" to me) on a night off, hop in LFR, ten minutes later I'm raiding.

I've killed an expansion's final boss within that expansion's lifetime for the very first time in my WoW career... there's just no topping that feeling to me, and with my odd waking hours, I simply don't think it would have been possible without LFR.

/highfive for my fellow shift worker! ^_^

I'll take that Highfive Swifty :)
I've worked the odd shifts too and yeah, what you said about raids and being replaced at the last miniute is true (I also got kicked out of a guild cause I wasnt 'raiding enough' even tho I was there for every raid but never got to go (and this is back in the 40 man days) and my GF at the time was one of the GL's ) so yeah, LFR FTW