Snippet Explorer should seach for all snippets in all sub-directories of the chosen option (including those with multiple sub-directories under it).
\VC#\Snippets\1033: Right now it only searches the C# directory
\VB\Snippets\1033: Right now it only searches WindowsForms and WPF
Without this support the "Snippet Manager" that comes with VS is a better tool to see all the snippets that are installed. Hope this can be in the next version.