Since there's not a lot of images of the full dashboard page in the article, I made two quick additional screenshots to compare the two. [1]
I think part of it is just that I'm not used to the new one yet - it takes time to find options which I could previously find more easily - but at the same time, if I want to put a bunch of sites into development mode to name one example, I now need to individually go into each specific domain's page, click the "caching" nav icon, and change it there. I feel like it essentially takes a single page two-click mechanism and changes it to a three-click mechanism across multiple pages that forces me to think about where I'm going much more than previously.
There's also a full API, so you can actually automate a lot of bulk actions (probably not so useful to end users, but if you have a lot of sites it might be worth it, and there could easily be tools.)