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Yeah. Some classes I think needed it big time. Feral DPS, for instance, was a nightmare. It was the most complicated class in the game, from a mechanics standpoint, though your average warlock and hunter had even more situational spells and abilities. By lvl60 I didn't have any unused keybinds for my hunter and by about lvl40 on my warlock (I leveled him just high enough for Chaos Bolt) was nearly the same. Folks have long joked about hunter being the "easiest class in the game" and it's bullshit. Not if you actually try and use all of the hunter's abilities. It's crazy. Maybe it's a little better now.
For the most part my rogue hasn't changed nearly as much from Lich King until now as it did all the way up to Lich King. I miss not having full, real talent trees. I miss the specs from Burning Crusade the most. Hybrid combat + subtlety especially. But mutilate (assassination) spec works pretty much the same as it has since it was introduced.
My DK though, every expansion the specs and mechanics get changed big time. I started out playing Unholy, loved it, then loved Frost. Now Unholy is no fun at all and just a tedious pet spec while Frost has lost a few of its most fun abilities. It's not as much fun as early Lich King. And I was, at first, unhappy with the changes to Blood but I dig it now and it's still the best class + spec for soloing elites and bosses.
My Paladin became less and less fun after they made it so that your shield didn't hit that hard. I'm hoping that the new expansion makes it fun again for PvP.