With the 35mm gear I tend to put whichever lens I felt like using that day on, sling the camera over my shoulder and go. 3 out of 4 times it's the 50/1.4. It's rare that I'll carry multiple lenses.
My favorite results lately have been with the Yashica A with its fixed 80mm, which I'd consider to be my usual one-camera-one-lens rig. That, plus #8 and #25 Kodak series V filters and the old Luna Pro F, and I'm generally happy. I seem to get better results when I arbitrarily limit my options.