Having used AE for waaay loner than I care to admit, I should know the answer to this, but:
Is there any way to set the default temporal keyframe interpolation to anything other than linear? Obviously there's the option to set the spatial interpolation in the prefs, but nothing about temporal, and nothing that I can find in the prefs file either.
Specifically, I use a lot of opacity keyframes, and things just look nicer if they fade on in a smooth, "easy ease" way. Pressing F9 each time I add a keyframe isn't too much of a pain, but doing it dozens of times a day for all those years does add up!