I end up just using Finder for Library browser. It does the job.
Yes indeed you can browse your folders with Finder's Cover Flow option if that is all you need.
Cover flow is the newest Finder view. It first made an appearance in OS X 10.5 (Leopard). Cover flow view is based on a feature found in iTunes, and like the iTunes feature, it allows you to see the contents of a file as a thumbnail icon. Cover flow view arranges the thumbnail icons in a folder like a collection of music albums you can quickly flip through. Cover flow view also splits the Finder window, and shows a list-style view just below the cover flow section.
Selecting Cover Flow View
You can display your files and folders in cover flow view by clicking the Cover Flow View button (the right-most button in the group of four view buttons) at the top of a Finder window, or selecting View, as Cover Flow from the Finder menu.
Cover Flow View Advantages
Cover flow view is a great way to search through music, image, and even text or PDF files because it displays an album cover, a photo, or the first page of a document as a thumbnail icon whenever it can. Because you can adjust the size of a cover flow icon, you can make it large enough to view the actual text on the first page of a document or get a closer look at a photo, album cover, or other image.
Cover Flow View Disadvantages
Displaying those thumbnail previews can hog resources, although most new Macs shouldnt have any problems.
Once you make cover flow view images large enough for practical use, you tend to limit the number of files that can be shown at any one time.
Best Use of Cover Flow View
Cover flow view is best for flipping though folders that contain a lot of images, checking out music files with associated cover art, or previewing text and PDF documents that can have their first page rendered as a cover flow image.
Cover flow view isnt very useful for folders filled with mixed documents and files, which may be rendered with generic icons.