Yep...I moved to the NW (seattle area) a couple years ago. They used to use a stadium in Tacoma, Wa for years...(someone told me since the early 80s) but for the past 2 years they switched over to the nearby assembly hall. We just went about a month ago (unfortunately :-/)
I think they are going to start doing this from now on in many areas. No reason not to, more $$$ in WT's bank account, it's easier...everyone I've talked to like it way better anyway, comfort level and no set-up, stage, sound systems etc.
It will be interesting to see more replies....I've been wondering how extensive this is.