So who is using Windows Firewall on their domain?

So I found this thread;

http://community.spiceworks.com/topic/106289-who-uses-the-windows-firewall

But that's almost 3 years old. That thread seemed to lean slightly toward more people using it than not, so has anything changed over the last 3 years?

Here we're still running XP and have it disabled, relying on an ASA5510 for external protection. Both my boss and I have agreed that on XP it's such a pain to setup, and we have so many exceptions for the "higher ups", it's just not worth it.

The comments about it on Win 7/Server 08 seem to indicate it's a lot better now, is it worth relooking at this if we make the jump to 7?