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2 of 2 neigh-sayers are horses

What would happen to somebody voting in opposition to a proposition at LDS General Conference?

I'm watching the semi-annual LDS General Conference. One segment just went by that was some general business of voting to retain people in various roles or assign new ones. Several thousand people are present and voting.

The camera work going into the live broadcast was hard to see, but it looked like the entire audience voted on every issue instantly and unanimously. Having watched and participated in many similar events both secular and in various Christian traditions, this seems inconsistent with what inevitably crops up: human nature seems to dictate that given enough people, there is always some sub-set of nay-sayers.

What do these votes represent? Have these issues been vetted some other way first? What procedure would be followed in the event of some opposition votes? Is it an issue of needing a majority? What personal experiences would somebody expect if they were to vote against an issue like retaining a prophet or one of the other major leadership roles in the LDS church?