Well, maybe not out-and-out angry, but seriously peeved. They've been periodically threatening me with switching my MyYahoo account to some newfangled ajaxy home page. My experience with it so far is that it's slower and shinier at the expense of just putting the text I want on the page in front of me.
The latest assault of trying to force me to use it happened this morning. I tried to go to the /switch URL that has worked in the past, and that failed. I did go to the 'switch back?' page, but when I clicked on the button to switch back, I still had the new UI. I noticed a link at the bottom of the new home page for switching back, and even when I clicked on that, it still failed and left me with the new home page.
It's getting to the point where I'm about to switch everything over to gmail and igoogle. Google's creeping me out a little, lately, though. It's all free to use, but maybe the price is too high <backgroundmusic type='ominous'/>.