I 100% disagree.
I was in an "attempting" pre-nerf Muru guild in TBC, I am in a far more casual guild now (raid once or twice if we are lucky a week).
There are far more mechanics (complexity) in Normal MoP Raids than in TBC raids let alone heroics.
What you are felling is just 100% nostalgia.
Have some specs been made simpler from Cata to MoP sure I can see that, Kitty is one of those and I am sure there are others but other specs have been brought up in complexity as well.
I do think they have the balance quite good just now you can get 80% out of a toon quite simply but getting a 100% is a big step up for most classes, which is a good place to be imo.