Like you I also print without cropping (unless you count cutting your photo paper into squares for 6x6 format printing.) To me the constraints of of the image in terms of composition and aspect ratio ends at the camera. There are times when I'm doing more experimental image work where I crop things but then it's usually done in a very dramatic and exaggerated way blowing up a small part of the negative as large as I can to produce a grainy, blurry blob of a thing. For my regular shooting, however, I don't crop. Perhaps a part of it is that I don't want to have to remember exactly how things were positioned if I want to go back and make additional, identical prints at a later date.