From what I'm told, Legacy = the avatar and postbit on the left rather than on top? Yeah... I don't like that, so I don't use that. I think it looks a whole lot nicer spread out along the top of the post, I much prefer it that way. I think having things on the left makes it look too much like it's "just a message board". It looks generic, I think.
I also display everything. I like to know and see as much as I can. It bothers me a little bit when a member hasn't filled out all the parts on their postbit. I like to know gender, age, location, join date... all of it. I realise that's their right, but it annoys me lol.
I don't understand it when people hide parts of the postbit - particularly the parts that show for every member like post count and join date. If I were to do that I'd feel like I was flying blind.