If I'm just running errands or shopping, I don't bother. I don't have the time or energy to worry about impressing a bunch of random people I don't know or care about.
For work, though, I do wear a bit of makeup. I work in a casino, a place where looking pretty means more tips, so I probably couldn't get away with not wearing it there. With that said, though, I'm very minimalist with it. Some concealer, a little blush, light eyeliner on the upper lash line, mascara, and a natural lipstick. (My profile picture is what my work makeup looks like.)
Basically I like the "looks like I'm not wearing makeup" look. I don't favor dramatic eyeliner, eye shadow, or bright lip colors. I like to keep it subdued and natural-looking, just doing a subtle little bit of enhancement on my eyes, cheeks, and lips.