When library view was first introduced we were able to see all the groupings as a row of links accross the toolbar. I really liked that. It was a graphical way to show the user all the choices they have to start filtering the list. I'd like to see that come back. After clicking on one of the links, the rest could disapear (since they are only global filters for the whole list anyway) to make way for the breadcrumbs.
I'd also like it if the links on each tile, could have a bit more space. Currently, if there isnt enough space on that tile, the links disapear and are replaced with a menu. I'd prefer it if the links could just have another line or two. I wouldnt even mind if the tile kind of faded out a little when you hovered over it, and then have all the links overlay directly over the album art.
Finally, it'd be great if library view could also be put on the left/right just like the panes.