Of course this is just my experience, but I already skip quests on purpose in favor of grinding. The one time I've attempted to do 100% quests, I ended up grinding too. There's just not enough experience to go from 1-60 solely through quests.
Of the past 3 level 60s I've leveled on 1x rates servers, I've done 5-mans...3 times? One run through of Scarlet Monastery, Maraudon, and ST. If I wasn't a warrior, I doubt I would've done any of them aside from ST for the class quest. It's a pain finding a group half of the time, and it's quicker for me to just bypass instances. I spent maybe 2-3 hours looking for an SM group so I could grab the sword of omen and another few hours getting to the instance, and clearing out the 3 of them, but I could've spent that time and gained maybe 2-3 levels and been better off from it.