I've adopted the "I don't care if you use IE" mentality.

I'm on OS X - if a browser doesn't run there, to hell with them. I'm not wasting the money to buy an OS I can't stand just to test a browser. I'm also not wasting time having to reinstall a VM every 30 days for the same reason.

When MS makes it painless to run IE on a Mac, then I'll actively test against it. I might not try to actively break it, but I'm not going to worry much.

And, thanks to Node-Webkit, anything that's critical can be wrapped up in an app.