I know this is terribly heathen but I tend to use sunny-16 and drop 3 stops for shadow. I have some other exposure values in my head that I know are fairly constant, like the brightness of typical office interiors and stadiums and of course my own home I have mentally metered with great accuracy. After that I feel pretty confident exposing B&W by eye. I often meter my palm and open a stop too.
Color I shoot negs the same way, slides (and digi) I meter for the highlight (more or less) and often guesstimate, though more conservatively.
(Shinjuku, Astia, metered for the vendor)