Just logged in for the stress test that just happened, and noticed that Western Thanalan was congested when I tried to get in there. However when I was able to get there, there didn't seem to be any major crowds or anything out of the ordinary?! Maybe I was missing something, but I didn't even see a lot of people while flying around...however Ul'dah and Limsa and major cities were very visibly crowded and I had no issues getting there.