How Do You Search Datasets: Search Engines, Major Data Catalogs?

Hello everyone! I’m doing some research on existing data search engines like Google Dataset Search, FindData, OpenAIRE, Datacite Search and so on. I’ve noticed a lack of academic papers and/or other research on how people search for datasets, what kind of features they need or don’t need. I know it’s quite common to search big data catalogues like Kaggle, Data.gov and others instead of search engines.
Personally, I miss geospatial search features like setting geospatial filters and coordinates. Only some specific data catalogues and search engines support this.
How do you search for datasets? Are existing dataset search engines good or bad, effective or ineffective? Which are the most helpful?