I'm guessing so, since 80% of the quests are shared between the four classes of your chosen side. Only the class quests differ, which is not much and not enough to level exclusively from. Where did the advertised 200 unique hours of gameplay per class come from?

I'm on my third character now, having two others who reached Alderaan. To be honest, the side quests are absolutely boring now, just like in every other themepark MMO. Voice over does not make the third time you do a quest interesting. The only interesting quests are the class quests, but sadly only constitute about 20% of the leveling process.