I modify Sunny 16 depending on time of year. Summer, mid-day at the lake here is definitely sunny 16 (shutter set to film speed, aperture set to f/16), but mid-winter noon is the same as late afternoon summer as far as light goes.
I look at where the sun is to determine the "base" exposure, then consider the lighting of the subject. It actually works pretty good, IMHO. I don't like on-camera averaging meters so much because I have to do the same kinds of adjustments to expose for the subject instead of the whole scene. If a camera is going to have a meter, I'd rather it be a spot meter.
Even if you use a meter for every shot, you still need to compensate for snow, backlighting, etc., so it's not like meters make everything foolproof. Averaging meters are great for scenes, not for isolating subjects.