Poll results are in on the DAM Learning Center site on how DAM users find assets.
What is especially revealing to me is how I, too, expected Keywords and Description to take up the largest chunk, but also how many other methods are used and included in the other category.
The system I employ has a good filtering system that allows users to refine searches by these types of metadata values.
In addition, if you read more of the results, you can see just how necessary rights related data is for the assets to be considered useable once located in the system. Media release status and copyright are no laughing matter and should be mandatory fields.