I sometimes work with PP but on a very beginner's level. And since I often foret how to achieve a certain effect again after having layered some PP'ed versions of the same fractal I always get depressed that my effects cannot be repeated (by me).
My greatest love is to produce several effects on my own, therefore I spend most of my fractal time with creating code, watching its effect on some standard Julia spirals or the primitive Pixel formula (a non-fractal fractal) and then delete these experiments.
What I like when working with fractals is - I can reproduce the image at any scale, zoom in and discover new "images", work on them, zoom in again, ...
As soon as I have PP'ed a fractal, this possibility is gone.
And my non-fractals made in a fractal generator - I stop when I am content with them, therefore PP is not necessary, or I am too lazy to do it...
Thanx for this interesting thread!

:rolleyes::sad:
Joy of Frax