Guild Wars 2 LFG system is clearly lacking, and sometimes you can spend hours in Lion's Arch hoping to find one last person for that particular place you want to go.
Those days of spamming chat channel are over (or if you're like me, those days of never doing dungeons because spamming in LA for hours is not very productive) thanks to this tool :
Just browse current LFG people or create your own, this works for all servers across North America, or Europe (but not between America servers and Europe).
Once your group is ready, jump in the dungeon and the party will receive a message to start it, even if no one is on the same server.
Maybe I'm just lucky, but as I write this I never ended in a terrible group, and we always finished the dungeons we were doing.