Sometimes i wish xmonad had 3d transitions between layouts. That's probably the only appeal of a gnome shell extension
However, I always found myself reducing the transition time bit by bit, until I eventually got rid of the transition. When I'm in the zone and coding I might be checking docs or some output on one workspace, and I want to switch workspaces and begin typing without the feedback delay. I already have the next 20 keystrokes planned out, and I'd rather be rate limited by my fingers than my WM.