Honestly I am an Aussie that plays on an NA server and don't have any issues finding people to run stuff.
Worst it gets is a weekday during 9/10pm.. A little earlier and a little later and you generally run into NA insomniacs.

Matters even less now that we have cross-server PF.

I know my post didn't really answer your question, but I guess my point is that as an Aussie, I am having no issues on an NA server.