I started out in 35mm photography with a Leica IIIf and later a Pentax Spotmatic, so changing lenses isn't as easy as a bayonet mount. But I still tend to never change lenses in the field even though I have some easier bayonet cameras. Like you I mostly don't change lenses.
My favorite travel combo is two identical bodies: one for B&W and one for color. Then if I have to change lenses (which I rarely do) everything fits.