Upon hitting 50 on your first DoW/DoM, you gain a 50% exp boost to your other classes.

Coming from FFXI where quests gives 0 exp and suffering exp penalties on death - I say the current system is already insanely casual friendly with FATE and Dungeons giving alot of exp.
People hitting 50 on NIN within 24hrs of patch, shows ease of exping.

Although some people may enjoy the quests, I personally find it tiresome to go through the same quest, same storyline, same CS over and over again for every class I decide to level in games that limits you to 1 class per character.