I assume you're using "grounding" switches. You'll notice that one of the mounting screw holes has a piece of metal in it that rubs against the screw to ensure a good electrical bond between the switch and box. So as long as the switch is mounted in the box it should be grounded OK. Now I wouldn't be surprised if the latest NEC requires a separate ground wire, but I didn't use one in my shop when I wired it several years ago. I did run redundant ground wires through the conduit as you describe.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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