My experience was more the other way around. I met a really cool person that introduced me to UU and Poly. I guess through going to Opus (the UU worship retreat for UUYA(young adult) I did meet a lot more polys/poly-curious people).
I have found that congregations and churches vary a LOT. And even my big urban UU church seems a bit stiff to me at times. But I feel like any city I visit I can go to service at the local UU church and make a bunch of friends. I feel the same way about Quaker and UCC churches, but I feel like I have to confess to them that I will never subscribe to their doctrine. I prefer the UU church where there are but seven principles and nothing else to subscribe to. And all of the seven principles are totally cool with me.