You know, I'm as supple and moveable as the next guy. But I really hate the 'change your UI' without some form of beta test offer. It's just plain silly.
Case in point. Yahoo when it was going to the new mail interface (2 yrs+ ago) they offered anyone the option to try it out. Then when i changed over, you were more likely to be prepared for it. Generally here I don't get those offers. Although being a poor blogger at times, I can understand why.