1) LDoN
2) death penalties
3) corpse runs (yes, really)
4) dots which actually lasted more than 30 seconds
5) meaningful travel times (somewhat ruined by PoP books) which meant the world actually felt (a) connected and (b) huge
6) proper snares. Perhaps I just haven't played the right EQ2 class yet, but back in EQ1 you could properly snare / dot because snares did a decent job and lasted a decent time. Why can't I quad-kite in EQ2?!
7) zone-wide quest events, like the Ring War in Velious. Again, maybe they're in there and I just missed them.
8) Multi-classing tradeskills - possibly my biggest want. I don't care if they make it horribly expensive - charge me 50aa to add a second tradeskill to my toon, but at least allow me to do it.
Well those are the ones that spring to mind :)