Should a switch near a sink be on the load side of a GFCI outlet?
I believe the NEC requirement is only that the receptacle be protected.  I don't know of any additional California requirement that would apply, or there could be something local, you never know.  

Is it better that the switch be on the protected side of the GFCI?  Well of course it's at least a little better.  The only way I can think of a switch zapping you in a way that would be protected by GFCI is if the switch wasn't properly grounded and somehow a loose connection energized the screws holding on the cover plate, something like that.  So it seems pretty safe to me in the first place if the switch is in good condition and grounded properly.