Ditto. Maybe it’s 20 years of editing on 2 screens but I can barely surf the web on 1 screen now. I keep the left screen for the library. And I don’t like the single viewer either. I keep the event viewer open pretty much at all times. When you’re using two screens there’s just wasted real estate if you don’t, unless you pop open the waveform/vector, but that decreases performance a bit.
I think the single screen mode is great if you’re having to edit on a laptop though.