Alt-tab to switch between browser tabs in Edge is new, a setting that you can turn off, and in some cases, it's actually very useful, since you can limit the number of tabs. It lets me treat recent tabs the same way as I would treat recent applications, which many websites effectively are. But anyways, that choice is made available to you.

I don't currently use multiple monitors, but I do use virtual desktops, and... that's exactly how I would expect virtual desktops to behave? If it only changed a single monitor, does that mean you'd have to go to each monitor to change to a different virtual desktop? Do you see virtual desktop configurations specific to each screen, or any screen? What happens if your screens are different resolutions. I think that Windows again has the superior implementation here.

Aero shake was pretty terrible, no arguments here.

The window history thing, Timeline, is something that I have disabed, but honestly sounds like an even better version of Recent Files, which is something many people use and might like something more full featured.