In snow leopard Expose places all windows (minimized and open) in a grid view. I don't mind that Expose shows minimized windows. However, the grid view actually slows down my ability to find the relevant windows, because pertinent information is lost by placing all windows in a grid such that the relative sizes of the windows are not respected, i.e. the sizes of the respective windows is information that lets me discern between windows. For example, I know that my aperture window is the biggest, my safari window the second, and my word document the third. In other words, I may not be able to see all the windows or easily find them, but I have an intuitive feel for what their sizes are and what they would look like if reduced in size and laid out next to each other.
Now, I believe that if I had, for example, 20 open windows, the grid view may actually be better, as perhaps respecting relative sizes would cause some windows to be too small. It's also possible that with so many windows open I would lose the intuitive grasp on what the relative sizes of my windows are and, thus, respecting relative sizes in expose would be more confusing than helpful. However, for under 10 windows or so respecting relative sizes really is better.
Thus, prima facie, Apple should reinstate the respect for relative window sizes in expose unless there are more than a certain amount of windows open, for example, 10. In fact, expose could have three options, grid, relative size, and automatic. In automatic mode my idea of switching form relative size to grid occurs after X number of windows are open.