We've just come across exactly the same issue, where the change in behaviour has confused all our editors and resulted in lots of font style html going into our CMS when we didn't want them.
We need an approach that allows 1 click, or one Ctrl-V action to remove all of the following:
1. Dodgy Word specific tags
2. Span tags
3. Font tags
4. Style attributes
This is basically a combination of the useful behaviour from the Old paste from Word option (removing spans, font tags etc.), with the useful behaviour from the New paste from Word option (removing extra dodgy Word tags which were not removed before)!
Tony, did you manage to create a HTML filter to do what you need, which we might be able to use to solve our headache?
Thanks,
Dave