Tan68, I cribbed an image from dpreview showing the D90's viewfinder:
The 11 dots scattered around the center are focus points and if you look closely, you can see a bracket around the selected focus point in the center (which is hard to see because of the color of the wasp). Using the directional pad on the back of the camera, you can move that bracket around to any of the 11 focus points. There's also an option for that selector bracket to glow red, either always, or automatically based on the lighting conditions. In automatic/dynamic focus modes, multiple brackets will light to show the active focus points, which I dislike as it overloads my simple brain.
Here's another image that shows every focus point selected:
It could just be a matter of taste, or like kiwi_jono suggested, what you're used to, but it seems like a more advanced viewfinder to me, and I wonder if Pentax will go that way eventually. I'd like to know what the 645Z has, but nothing I can find online shows that. Anybody here used one?