The windows key is very mnemonic in nature because window correlates to display and to an app window from which there are multiple display/window moving keyboard shortcuts tied to that magic button
ChromeOS had a similar chance to make Search button (Globe) the window management key. But somehow they messed it up and now window/desktop management is sometimes using Search button, other times using Alt. Huge missed opportunity for those of us with worse memory.
Windows key is super-useful on Windows, and it gets better every version.
Aside from the Win+Arrow combinations, which are probably among the most useful, other ones that I use daily are Win+. to bring up emoji keyboard, Win+V to bring up clipboard history, Win+T to navigate the quicklaunch/taskbar apps and (less frequently) Win+Plus and Win+Minus to zoom the display. There are some new settings shortcuts too like Win+A for mini-settings (like Android swipe from top), Win+I for proper settings and Win+P for projector settings.
Plus there are all the old keypresses that have been around forever like Win+R run, Win+L lock workstation, Win+M minimize everything, Win+D for show desktop toggle, Win+S for search (used to be Win+F/find), Win+E explore... I think nowadays I use Windows button as much as I do Control and Shift.
Alt is less useful since applications stopped having menus, but AltGr is great for international input. I suppose Win+Space is important to know too, if you switch keyboards a lot (I do).
The Gnome and friends defaults puts Linux in 2nd place IMO. However, like nearly everything Linux, if you're willing to put in a little bit of effort and/or go down more esoteric routes (i3 is clearly the most efficient I've ever been...the problem is that I'm forced to use macOS and Windows as well, and switching from i3 to the others is really difficult) it can easily be the best.
macOS seems the weakest. There are utilities that can equal functionality from the other OSes, but even then it feels unnatural (a lot of animations in nearly everything doesn't help)
It's been a long time since I used Windows 95, but I'm pretty sure most of the basic window manager keypresses were there. Stuff like Win+R (run), Win+E (explorer), Win+M (minimize everything) etc.
https://apple.stackexchange.com/questions/367858/does-macos-...
Window+Right --> move this window to the right of the display, to the second monitor if repeated