espcially in low level dungeons, if someone wants to bail out for whatever reason, it seems most people don't know how to simply leave the dungeon and choose to disconnect instead. This stinks for a number of reasons:

1) it stinks for the player doing it because they have to re-log in and launch the game after their character is removed from the instance, wasting their time
2) if you don't leave via the leave button, the party has to wait much longer before they can search for a replacement.

Either way, everyone loses when you quit dungeons in this fashion, so don't do it, and since a lot of people don't know where the leave button is, the game should tell them where it is before they do their first duty finder mission.