You can bind back alt-tab to switch-window:

  gsettings set org.gnome.desktop.wm.keybindings switch-applications '[]'
  gsettings set org.gnome.desktop.wm.keybindings switch-windows '["<Alt>Tab"]'

There are more settings like that which you can find in the manual, or from other frustrated users.

These settings seem to be stored in a binary format so the resulting rc-files can not easily be commited to git. I keep a dozen lines like the above in a script I run on any new gnome-like desktop to make it somewhat sane.