I just learned that in Word, I can use ctrl to highlight multiple different sections, then apply the same formatting (bold, or a font size for example) all at once. This functionality would be fantastic in the Marketo Email editor.
I always use another tool to strip out all the junky Word formatting before recreating my emails in Marketo. But then I need to re-apply all that formatting. When I've got a list of items with similar formatting it can be lots and lots of clicking. This would reduce that clicking significantly.