I'm not saying you have to.. but they do add up and give a substantial increase to the affected stats.. but yeah its a time consuming effort.. mostly trivial (save for the oddball mechanics thing , jump through hoops etc) but yeah some older content I just like doing every now and again..
nostalgia is a powerful emotion.. look at all the EQ players still around! lol
There are some drops for classes to go back and farm, so I do. It is not challenging, but useful. IE the AC aug from LDoN, the anguish clickie BP, illusions and tradeskill stuff. So enjoy the nastalgia, and get what you want/need.