I agree. I'm running the new OS. There were some UI changes that frustrated me. But when I thought about why I was frustrated, the reason was simply because the UI was new and my old habit patterns didn't work. When I took the time to learn the new UI, I liked it more. The event was a learning experience in why people hate change. It takes effort to realize the benefit (if there is one), otherwise without the effort just frustration (unless the change is bad).