Compiz is the name everyone remembers, but the Beryl fork was what had all the excessive effects. When the projects merged back together into Compiz Fusion they dropped like 60-70% of the functionality, and then dropped even more when it was later renamed back to Compiz.
I had a highly customized setup I really liked (I was even using the advanced features to target dropdowns and popups to give them their own effects, or disable effects for specific programs for speed), the only reason I moved away from it was all the customization disappearing. Some of that dropped functionality included keyboard controls for new ways to navigate or arrange windows, losing those indirectly led me to tiling window managers.
I had a highly customized setup I really liked (I was even using the advanced features to target dropdowns and popups to give them their own effects, or disable effects for specific programs for speed), the only reason I moved away from it was all the customization disappearing. Some of that dropped functionality included keyboard controls for new ways to navigate or arrange windows, losing those indirectly led me to tiling window managers.