I can't wait to use them when this is implemented in 2020.
Neat feature. Probably won't be relevant by the time it's approved.
Now all that being said, if IE really has gotten it's act together as you say then I'd be happy to call it a day. Unfortunately no matter how wonderful it is, it probably won't matter until IE8 and IE9 virtually dead (<7.5% of sessions for a site).
Edit: Release schedule of Internet Explorer... IE7: 2006, IE8: 2009, IE9: 2011, IE10: 2011 (announced "3 weeks in development")
I really don't get why MS don't fork their browser into corporate and consumer versions. Let the corporate users run on ie6/7 or whatever legacy crap they need and let the rest of the web move at a reasonable pace.
Anyway that's where I think the hostility to IE is coming from.