So, I like the Group Finder. But outside trial groups does anyone actually use it? I am not sure most players know about it, and if they do, they probably don't check it unprompted.
My suggestion is to let us link the listings in the chat, like people are doing with guilds (Instead of using the guild finder). Maybe with a cooldown so people don't spam it.
I am not sure how else to improve the visibility of listings without throwing it in the face of anyone joining a zone or when a listing is made, etc., which I would imagine could get very annoying.
I keep setting up groups, either for fishing, dolmens, the wall event, pvp groups, etc., but no one uses them unless you tell people about the group, and even then, it's rare.
It's a really useful system that just isn't being used.