Not on WoW traffic (which isn't throttled here in Netherlands(me)-Belgium-France(servers)), but on bittorent some clients support traffic encryption and obfuscation so it doesn't look like bittorent traffic. It will then not suffer from idiot ISP's who use throttling on such traffic. Like on your perfectly legal WoW patches. 
Former www.diablo2.com webmaster.
When in deadly danger,
When beset by doubt,
Run in little circles,
Wave your arms and shout.
When in deadly danger,
When beset by doubt,
Run in little circles,
Wave your arms and shout.