=Deathscythe343;2605385...
As a WoW player, I can definitely say that this was not the case, at least for the release of TBC (their first expansion). However, the grind to level 60 (cap for classic) was atrocious because of the lack of quests. It was still easier to get to lvl 60 after TBC because you could access new areas at level 58 and have a flood of quests for exp. It was made easier on the second and espically the third expansion to catch up the previous level cap and get into the new content.

In WoD, you'd only get a character to level 90, which was the cap for MoP. All this really does is let you get into WoD content as soon as possible, making it feasible for new players to join in if they were newly invited, or for veterans to create new characters on another realm with their friends.

But you are definitely right in the "if its new, it'll be fast" quip. This was the case for ninjas with FATE trains, and espesically the case for the Sexus grind when it came out. Have fun finding a party for sexus light farm or even finding someone that's still updating the bonus light window if you werent working on it the first 3 weeks after release.