It really sucks to have this feature in the game but to see nobody use it! I was trying to group into any of the veteran Daily Pledge today via this tool and after 30+ minutes of waiting I gave up and logged off. (PC EU)
Players choose to hand pick their party members for the veteran dungeons (and dailies) (e.g. LF tank/heal/dps 600CP+ experienced, has to vote for Trump and be transargonian) which cripples the less experienced players, or players that do not do alot of PvE or are just getting into it.
For the Dungeon Finder to attract even the more experienced players, it would need to have give a satisfying reward for grouping with randoms instead of your experienced mates. For example an extra key in the daily, extra experience, more gold, better loot, whatever Zenimax decides is fitting.
It could also implement a battle level system to give those inexperienced and ungeared players a boost in stats, even though most of dungeons are mainly strategy based.
I have nearly 1500 hours into this game and even at this stage I sometimes struggle in some of the more challenging dungeons, I would never imagine how a casual player could complete these dungeons unless carried by 3 exceptionally experienced players.
TLDR; It would be nice to have a dungeon finder that actually worked, showed approximate group finding times and show the current pool of searching players. It would hasted the process of clearing dailies and probably help make the whole game experience feel more fluent.