I agree that a "Shared Notes" section would be nice, but I have a feeling that the Evernote people would rather us get the premium/corporate edition. Anyway, here's workaround that I've used:
Create your own note titled something like, "Other's Shared Notes." Then, whenever someone shares a note with you:
Open the shared note
Go to Note > Copy Note Link
Open your locally stored "Other's Shared Notes" and paste the link
You can fine tune this in a couple of ways. You could have one large locally stored note with categorized lists of shared note links, or perhaps several locally stored notes that have links to a specific set of shared notes. Whatever goes along with your work flow.
Using this method allows you to both search and access shared notes.