I also come from film, and often from medium format (6x6) film, where one roll was 12 exposures. Even with digital I've never gotten too snap happy, but I don't often shoot things with a lot of movement. If I have free time I'll scan through some images on the camera, but I don't delete them from the camera unless they're obviously bad. I'll import them into Lightroom and in the Library module go to single image view and 100% (zooming in and out to look at perspective and framing as well). I tend to be ruthless with my images, so anything I'm not happy with gets immediately flagged as rejected. If I think I can do something with it, I'll keep it and move on. Once that's done, if I have a sequence of similar images, I'll use the Compare mode and select the best one. That one gets stars and the rest don't. From there I get to the Develop module.
Mike.