I remember that VFR traffic in Bravo was usually coming or going to Palo Alto or San Carlos towards Downtown San Francisco. If there were no departures from 28 L/R, your clearance into Bravo included instructions to remain southwest of 101 at all times. If there were departures from 28 L/R the clearance was to overfly the field. I think in both cases the altitude to hold was 3000ft.
Controllers were usually pretty good at keeping everyone far apart.