I made a thread this month about this problem, only not in WordPress, but my custom CMS. I finally found convertwordtohtml.com "Word Cleaner" and it has been a God send. It literally takes me 5 seconds to convert 50 .docx files into .html files that I then open in notepad and copy/paste to my editor's html view.
What I love about it is it has a template system that allows you to specify find/replace variables like “ to " to automatically convert magic quotes and other Wordcrap into html code.
It's fucking expensive but the time it has already saved me has paid for itself.