Still stuck with using Windows to be able to play any latest AAA game.
That it plays games is just a bonus.
macOS of course has cmd+tab, but that switches apps not windows.
Windows 11 adds snap layouts, for which there is currently no analog, but this will let you do the side-by-side thing from earlier versions of Windows as long as you can tolerate the fullscreened windows becoming their own Space. (I actually find this preferable myself, but YMMV.)
I use macOS as my main driver, though.