Yes, this expansion is severely lacking in new features compared to previous expansions.
HoT and PoF introduced new core mechanics to the game (gliding, masteries, mounts, break bars, etc) but I don't see anything significant in EoD.
However, I'm also not really disappointed.
1. The game has no subscription fee, so you only have to buy a new expansion every 2-3 years.
2. They keep pumping out new content (maps, stories, achievements) at an impressive rate, especially when compared to a certain other MMO that has a subscription fee and a billion-dollar company funding them.
Just my 2c.