If I remember correctly, 95 had grammar checking as you write (but the grammar checker was, and remains, terrible). I can't remember new features after that which were particularly useful.
2000 introduced the ability to click anywhere and fill in whitespace, which made people use styles less and generally made output worse.
EDIT: I had a look at Wikipedia's list of new features in Office 2000 and, of those, the only thing that looks like I'd care about it is the new vector and raster graphics program. Which seems to no longer be part of Office.