The quests get better after 50 due to them being more meatier and more story heavy. There are still the dungeons and primal fight queues to look forward to, but you can always pf them and get into them generally faster than just standard queue. A good FC will help you go far too. Leveling will get super fast after you unlock Palace of the Dead, but the game is designed to get your first job to level cap by following the msq and side quests that run alongside it. You can skip most the side quests and do the previously mentioned Palace or FATES to supplement your exp too, so that's a perk.

There have been complaints about dungeons being part of the msq but it doesn't seem to be going away anytime soon. Nice thing, is they are not difficult by any means.

The battle is more complicated, but still simplistic compared to other mmos. It takes very little to learn your role and perform it well if you try. But it is much more fast paced than it is currently for you.