Creating a View of nodes with field for workbench moderation state without showing every revision?
Immediately after asking this question, I realized there is a filter criterion that can be added for this.

Workbench Moderation: Current can be set to filter based on whether a revision is the current one, and all previous ones can be excluded.

This will also exclude nodes that haven't been created or edited since the enabling of Workbench Moderation for their node type but will include newly created or edited ones.