It's interesting how things turned out.
I went through EW first on the US server, and all the leveling dungeon, my tank had instant queues. After that, I did all the EW end-game content, healers were never in short supply. With Panda raids in the duty finder, even now, tanks have near instant queues.
Adv in Need is usually for a tank for most duties (except Alliance Raids).
On resuming my JP char, I find it is even more tank-drought than ever. No shortage of healers.
Experience would conclude that there is an abundance of healer players, and it does not chime with the negativity of these forums.