...asside from that time we unknowingly helped Drakuru take down Drak'theron keep in the name of the Lich King...
...and when the Lich King killed us in Howling Fjord, then suggested we continue on as he has a plan for us...
...and that time where he got sick of Drakuru and had us kill him.
...and that time when we watched him torture Bolvar Fordgragon in ICC via Yogg-Saron's vision.
...and that time where we helped him cleanse Stratholm to eventually get him to chase after Mal'Ganis.
Aside from those times, yeah, we did nothing but defeat the Lich King.