This brought me back after quitting
I have to say, I played WoW for over 4 years, and I quitted 5 months before this expansion came out. As I already have the whole I decided to give it a try, and man, the new world is a fresh new way to play the game.
Even though its basically the same, the world follows a more strict story, with several cutscenes and a variety of quest tasks. Of course, you will still do the classic "bring me x of this" or "kill x of these", but often you get into more varied tasks, such as training your focus to break materials like a martial artists and then use it to defeat a giant bug, ride a giant monster to stomp enemies, sneak around to bomb a cave, snipe enemies with a rifle, and so on.
I just leveled my main, so I don't know how repetitive it will feel when I get to level my alts, since I will be doing the same exact stuff. This time, you visit pretty much every Pandaria zone to get to max level, you don't exactly get to choose between different areas.
I still have to try the raids, but the dungeons are interesting enough.
The new world is filled with dailies, and some of them involve planting and harvesting crops, that take one day to grow before being able to harvest them, giving out valuable materials for cooking that you can't get any other way (at least not for a low price).
I'm really enjoying the new content, just be warned, that if you want to do everything you will need a lot of free time, since the reputations this time are much more important than just some vanity rewards.