Originally Posted by toddos
Let's say you have a reasonably-sized library of 500 books. Let's also say you have a 1920x1080 screen and you run calibre full screen. Finally, let's say you display covers at 128x128, because any smaller and they don't convey much information (also assume that covers are perfect squares, which they generally aren't). For usability, let's assume that there's a 20px gap between each cover. So, each cover requires 138x138px to display. Assuming no other chrome and complete edge-to-edge layout of books, you can fit 13 covers horizontally and 7 covers vertically. 13x7 = 91 covers == 6 pages of covers for your library. And that's best-case scenario. If you're a more average user, with a 1366x768 display, with sidebars and other UI chrome enabled in calibre giving a ~800x600 display area. You're now down to a 5x4 grid. 5x4 = 20 covers = 25 pages in cover view. Maybe that sounds fine to you, but that definitely does not work well for me.
I would respectfully say that when I made my suggestion of this in this thread, I in no way meant that this would be the ONLY method of display.
I would also envisage it being used only in what I would call sub-libraries. Such as after applying a filter, such as someone who wants to see all of their titles by one author, or genre, or date added.
Ultimately you answered your own question. It wouldn't work for you ... and you wouldn't make use of it. And that is absolutely fine.