I think it has to be something on your computer. My eBook library folder is a little larger than yours (29.3GB, with 24665 folders and 84328 files). It takes about 20s for Explorer to display the contents of the folder when I first open it, but a right-click is instant. As you say, it sounds as if you have some sort of shell extension installed which is scanning the folder when you right click, but I'm afraid I don't know what it might be.
I'm running 64-bit Windows 7 on a laptop with 4GB RAM, so I suppose it's conceivable it's something specific to Windows 8, but that doesn't seem very likely.
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