Exactly! Many seem to think it's always such a different experience leveling another class but it's not. Only small part of the quests are different and those are the few class quests. Once you level 2 characters to 50 and start the third, you'll see it's not that awesome anymore as it was the first time.
I for example can't be assed to level a third class to lvl 50. It just doesn't feel worth it at all. Since I already ''experienced'' my favorites; BH and Sith.