Not a user of Evernote as I would only use such a service if the data on the server is encrypted. I assume a lot of users see Evernote not as a sharing but as a note keeping tool and are assuming a great deal of privacy. I understand it is tempting to have so much data potentially to access but frankly I find the plan horrifying, the opt out not acceptable and the notice period too short.
End-to-end encryption is tricky for companies like these, and until the main stream starts demanding encryption, private companies will continue to ignore it.