Yup; for a while I felt the magic went out the window as of Cata (and I still think it did to some extent), but then WoD happened and...well, to continue on that path would consist of game bashing, so I'll leave it at that.
Depending on where you left off at level 50, you may have a ways to go before you reach HW content.
On that note, do you have HW? If not, I'd go ahead and pick it up. That way, the remaining level 50 MSQ will give you a decent amount of xp. May not be as big a factor now as it was at HW launch, though (I recall doing literally every side quest in HW and I still had to spam run dungeons to reach 60).