I'm in the process of switching from PC to Mac, but am unwilling to buy Adobe PS again (my post-processing is quite basic anyway so PS is not needed). However, I really liked making my personal F-key Actions in PS for basic things like contrast, curves, resizing, etc.
Which (if any) other editing programs allow for this?
Have you looked at Lightroom, there are plenty of presets available and you can create your own. Unless I'm getting into layers and composites I do most of my work in LR4.
Aperture my have similar features but I don't use it so I don't know