In Ubuntu 16.04 I installed a Compiz plugin with an alternative alt-tab switcher that had the nifty feature that until I let go of the Alt key, it hid all other windows and showed only the one I was about to switch to. This is very useful when one has a bunch of open terminals that don't look all that different as thumbnailed previews.
After upgrading to Ubuntu 18.04 this can't be used anymore (save for explicitly switching back to Unity, which I'd rather avoid for unrelated reasons).
Does anyone know of a similar switcher I could install for the GNOME desktop?