Definitely. This again is a self-perpetuating thing - it's quicker and easier to grind out the higher levels via FATEs, and it's easier to do that either in a group or with your chocobo out, both of which prevent you from queuing in DF. Apart from the daily roulette, I don't think I queued for a single dungeon from 30+ on my PLD, because in the time it took me to run through a dungeon with a 90% chance of getting horrible DPS that took forever to clear the place, I could just farm FATEs and get more XP.
Of course, the flip side is that when DPS are faced with 30+ minutes of queuing while they can't party or get their chocobo out, they'd probably rather drop out and grind FATEs as well, so it probably regulates both sides of the queue as much as each other...