Gotta disagree here. While the leveling portion is definitely in, just about everything else has been distorted big time. One of the big draws in the game was the social experience, you made tons of buddies while leveling, often because you had to group up with other people, whether it was dungeons, tough quests, or if you just needed help with some odd ball thing. Nowadays you can hit 90 without ever talking to anybody because of stuff like LFD and the quests being incredibly easy. I think it kinda sucks out the fun because you never have a reason to make buddies with anyone, and easy content IMO just simply does not feel rewarding.
At 90, I think it's even worse. You're forced to go into random queue's with strangers you'll never meet again, and then the jump from LFR to actual raiding is incredibly huge. In the previous versions of the game, they'd at least do stuff to prepare you somewhat, whether it was grinding out gear, or just doing 5 mans which required much more coordination now then they did back then. The essence of the game has changed greatly IMO.