I had one account levelling and the other sitting at Nalak the first week. People still seem to come along and do Nalak, even if its a lone 110. Managed to get one account (15ish 100s) done in one afternoon. The guards do a lot of damage so you could pull it into them on a level 100 BUT then theres that whole issue where if you don't do X amount of damage to the boss when you are alone then you don't get credit...
I haven't seen any Nalak groups but I have also not been actively looking. I park one account there and cycle through my characters while I level something on the other account.
I guess Nalak is different to Oon though since he has less health and isn't over in China. People have to pass by him to get to ToT, which is now required for some profession quests and is easy to clear through for mounts.
Also, +2 to mounts but not going to include a screenshot because they're the ones everyone's already posting; rat and fish.
I went to the Eye of Azshara island in search of Kosumoth the Hungering for the Fathom Dweller and pet but WoWhead comments seem to have no idea how he spawns apart from a very vague comment about the /yell that says something about players being named, so speculation its some sort of summon. I ran around killing the naga mobs that looked like they were channeling/casting but nothing happened. So pretty clueless as to how old mate actually spawns :/