Until Dropbox provides a feature to easily redirect your local folders to the cloud-based Dropbox, you need to use symlinks or consider abandoning the default Documents folder on your Mac.
Being a purist, I wanted to keep using the entire Documents folder without symlinks for new subfolders I wished to place into Dropbox. This forum post at Apple Discussions provides a quick and easy solution.
Word of caution: if you drag the contents of a folder (such as Documents) into Dropbox and shortly thereafter change your mind (and drag it back) you may find all of those files are deleted from Dropbox and you Mac. Be sure to have an up-to-date Time Machine backup before you perform large file moves.







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