Organizing books, movies, games, or music albums. Each database entry could have fields like Title, Author, Status, and a crucial Cover Image field. A Gallery View would allow users to browse their entire collection visually by cover art, making it faster and more enjoyable to find items.
I think that this is planned. The Logseq product roadmap posted in November mentions being able to customize gallery view more, including being able to indicate which properties are displayed. But yeah, this would be a great feature!