I doubt you can extrapolate from your experiences on a single MMORPG to the industry as a whole. Grind may well be intentional in your case, or in WoW; but in (many) other MMORPGs, the designers put a lot of work into reducing grind. Grind is always a double-edged sword, and rather than focus on grinding for grinding's sake, I recommend you focus on creating a compelling gaming experience first; worry about metastructure when you've managed to do that.