Yes. While there are some people who have no issues finding quest XP, many end up short. Mob killing gives you little to no XP. So, how do you level when short on quests? Dailies.
Always do the best one you realistically can, which at this time in the game, means CoO/Xaviera dailies once you have access to them.
Daily reset tickets are hot items when they go on sale, because people buy tons of them to level up second and third class. That should probably tell you all you need to know about importance of dailies, if people are willing to spend diamonds on them.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.