New feature:
You enter the LFG interface. You list the dungeons that you want to run along with their levels. For example, all SL dungeons at keystone levels 14, 15 and 16. Anyone making a group that fits those criteria can instantly see all people that potentially want to run that key and can invite them.
Easy peazy. You no longer need to manually apply and reapply for hours. Just list your preferences, hit up LFG and wait until you get invited.