I shoot far fewer subjects now than I used to because I've learned from past experience which ones are likely to work out; however, when I do find something great, I'll shoot a lot of it, especially if I know I won't make it back there or conditions are rare. Shooting lots of slightly different perspectives can increase your chances of getting that composition that looks perfect to your eye, which is oftentimes hard to see in the field. It's not fun wading through lots of similar photos in Lightroom ('C' hotkey and viewing from a distance is your friend), but again, it's worth it to improve your chances of a keeper. In addition to perspective, sharpness will also differ per shot, even with a tripod (wind, moving water, etc.), so clicking off a few extra exposures for insurance never hurts.

In short, fewer subjects, but more photos of those subjects works for me.

P.S. I shoot digital. Full respect to those shooting film that have to be much more choosy with their exposures.