The "Overview" effect does all that. Switch window, switch desktop, launch apps, drag windows to different desktops and monitors, etc. In KDE5 it appears to be in the list under Workspace→Workspace Behavior→Desktop Effects→Window Management. …I think I may have had to edit `kwinrc` to get it to bind to just Meta without another key, though:

https://askubuntu.com/questions/1391793/kde-5-24-overview-la...

https://www.reddit.com/r/kde/comments/wl29ub/comment/ijrr6w0...