I agree completely. As a casual MMO-gamer I find the work/reward system to be the most enjoyable part of WoW. The fact that there is always SO much to do in this huge landscape is what keeps me coming back.
Have a bad day at work where you feel you have been "grinding" for 8-10 hours and accomplished nothing? Hit a raid or daily and, poof, you just did something useful with your day (emotionally at least by comparison).
Some days I just like to sit around and fish for that damn turtle mount ... doesn't matter that I haven't gotten it yet. It was the same for the TLPD. Until you happen upon it by chance and you get really excited because you haven't actually seen it in 2 years of playing the game.
So, personally, I love the new content. Have always enjoyed the background music for many of the zones (even bought the soundtrack a few years back). The back stories are engaging and the characters/NPC's you meet are often hilarious.
And speaking of grinding ... go for Insane in the Membrane and THEN complain to me about grinding... sure, it's easier now that the Shen'dralar are gone ... not.