Hi JD,
I am one of those, “get to know your camera to avoid PP” freaks. I spend hours learning exactly what each setting can and cannot do. All the time the Photoshoppers spend in front of the computer “fixing” images I spend experimenting with settings.
I shoot any mode that I find appropriate. Shooting in Programmed Auto makes it so much easier when you are under pressure and you know you are going to mess up.
The only Manual mode on your camera is M, the A,S and P are basically Auto modes. Shooting in P is in my opinion no sin, provided you are not using a D800 and then “fix” your images in Photoshop. If you are you are wasting a very good camera and you could have bought a cheapie and spend more on a computer and software.
Shooting in P mode you still have parameters you can control and it still allows you to be more creative that those shooting non Pro cameras in Auto mode. As long as you know what parameters to set up correctly to get the shots looking like you like them to look, there is no reason why you should not use P mode. If you are comfortable shooting in P mode, like some others finding comfort shooting in A mode or S mode ( both are Automatic modes), so be it.
If you tell me you are “fixing” images in Photoshop after capturing it with a D800, I am not going to be very impressed. At most you should only enhance images coming from a D800, no more. If for any reason, you need to do more than you can do in Lightroom, you are wasting the D800.
Enjoy shooting in any mode you like, as long as you get the shots (without Photoshopping it).
(This is my personal opinion.)