Gallery view is pretty new and still needs to be discovered. Also not very convenient just for quickly viewing bunch of files. The view of the folder changes completely, so you get disoriented and if it's a large folder you will need t skim through one line of folders to find what you are looking for. It's good for certain use cases but it doesn't help with quickly going through some files in a large folder.

On Windows, when you open a photo by clicking it, you can go to the next/prev one using the arrow keys and on macOS you can't do that. So the Windows immigrants get annoyed, naturally.

On Mac, you can simply select a single file anywhere and hitting pace will very quickly show you the contents, hit space again and you are back to the folder. You can use the arrow keys to skim around and the file contents will be quickly displayed. If you first select a bunch of files and then hit space, it will loop though your selection when you use the arrow keys.

It's a very convenient feature to skim through the files in a folder.