I still use (KDE Plasma's) wobbly windows, but set very low. In general in GUIs I prefer a very quick animation to an instant change, perhaps because it helps make things seem more fluid and dynamic and because it guides my eyes to where a change is happening in case I'm not already looking straight at it.

Oh good times. With Firefox 2 (or maybe 1.5?) no less!

I remember spending a lot of time trying to get Compiz to work. The rain effect was my favorite, it even had windshield cleaner!

Edit: here's the rain effect - https://youtube.com/watch?v=1ZKmQS_MNAg