Oh my.. Yes this. SM/Ruin and Sl/Sl were two of the best times I've ever had with the Warlock class. Oh man good memories.
It's funny, they claim that vanilla, tbc, etc talent trees sucked because there was no choice. Yet I remember many many choices of specs during those years. It led to some very creative things. Even for high end raiding, we could spec what we wanted pretty much. I remember I was playing a Mortal Strike PVP spec Warrior all thru AQ40 for example.