YOU GET PRESENTS ON EASTER? WHAT KIND OF A LIFE ARE YOU LIVING?
Once you become the leader of the Companions, yes, that quest line is done. You can still do smaller quests for them if you'd like, which is an okay source of gold, but that's really all. You can marry somebody from the Companions once you're the top dog (geddit? top DOG, because werewolves... oh gosh that was so bad). Who are you marrying?
Author's response
Um.. I wanna marry either Vilkas or Farkas..
Top dog.
JOKE OF THE DAY!
I KNOW RIGHT? WHAT IS LIFE WITHOUT EASTER EGGS.