After Effects Keyframe Loop Button
I use the loop expression in After Effects a lot. Like, a LOT a lot. To save typing the expression every time, I wrote this script UI panel button to do it for me.
This button gradually morphed over time as I picked up other looping tricks (thanks, almost singlehandedly, to the wisdom of Dan Ebberts) so it now includes options to loop in and out, as well as looping path shape animation too.
Now you too can shave precious motion-graphicking seconds off your day by installing it in After Effects and looping keyframes to your heart's content!