Ul'dah is definitely the least popular of the wards, but I got in there because the lots around the middle are all nice (I got the one right next to the waterfall)

On Hyperion, Ul'dah ward 2 just filled the last plot of land, and I regularly see people hanging out in the centre area by the AH board. Just seems to be everyone's spot. I dont go looking through other people's houses so I dont know if there's people in there, but quite a few of us hang out in the Goblet when we're not doing something in particular.