I built another approach specifically to address this question. You could browse your workflows and locate the workflowset.meta XML file of each workflow and extract the relevant data from there.
Workflow 
Use KNIME to search KNIME's workflow.knime and extract content
External resources
Used extensions & nodes
Created with KNIME Analytics Platform version 4.1.2
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KNIME AG, Zurich, Switzerland
Version 4.1.2
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KNIME AG, Zurich, Switzerland
Version 4.1.0
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KNIME AG, Zurich, Switzerland
Version 4.1.0
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