Probably already mentioned:

A real old timer remembers when dragons could multi-class.

A real old timer remembers the resource server lag days in the beginning when you could load up your inventory with thousands of a resource and hope you can run fast enough to the processing machine before getting caught with the stuff showing up, being "overburdened" and could not move.

A real old timer remembers the days of guilds camping Feladan because it was "THE" place to level groups off of the 35th - 40th level undead and spiders.