I use busses/subway at least once a week. Cabs are also something I use often enough. No doubt I would use them less if my gf was just as much of a cycling nut as I am.
I would certainly use it a lot more if it was more bike friendly... I really wish we had those bike racks on Montreal busses. We're also supposed to have cabs with bike racks in montreal, but whenever you mention bike, cabs avoid you like the pest.