I use
P a lot of the time ( And im most ( definitely
not) a
Plonker or Cheat

)
Why?
Im not a "
purist".

And Ill do anything for an easy life... and I actually get good results with it. Maybe not the very best but hey , life is not a
Photocontest AFAIK 
. If I dont like its chosen settings I just shift the dial to A or S , such is the simplicity of digital. You can see right away how you fared
It is a lot more versatile than Auto ( that is cheating

) and unless you are particularly concerned about the use of fast or slow shutter speed , Small or large aperture for creative output, you can get the image instantly and being digital if you don't like it try a range of settings in Aperture or shutter priority Modes
There are times when you want to take the picture..right now., this instant Period
If you get it wrong , Aperture or Shutter priority modes are less forgiving Certainly if you get it right with them the Picture might be a rather more outstanding
It can be argued that using Manual focus and manual mode and an off board light meter is "
Proper
photography.".

My point: All the modes have their place and the Program mode is there if you don't feel like doing a quick mental on your feet
It also exists to help you when learning to compare the difference in your settings with A and P ( or Manual) and the Cameras
You can get good images with all the modes as long as you learn you kit well
Photosnobbery amuses me