At risk of sounding like an Evernote apologist, I'm going to repeat a question I asked to another commenter elsewhere in this thread:
Why do you consider it a "nightmare" to get your data out of Evernote? You can select one, several, or all of the notes in a notebook and export them in either HTML or XML format, with all metadata (tags, etc.) and embedded media included. That seems pretty good to me, and it's certainly easy. If you wanted something more sophisticated, Evernote on the Mac has exceptionally complete support for AppleScript, so you can code up whatever kind of fancy extraction you need.
I'm not asking to be argumentative; I've always considered Evernote's support for extracting data to be pretty darn good, and clearly superior to many competitive apps/services, so I'm curious to know what additional functionality you would require before you'd say it's not a "nightmare" to extract your information.