I'm still certain that the notification centre with the tile that we saw in the leaked screenshot was only part of it. We did, after all, see that asterisk on the task bar too, which leads me to believe that there might also be a drop-down menu of some sort and thus multiple ways to access the centre.
That said, I don't necessarily have much use for a notification centre either, but I will say that I'd like to see WP8 get one anyway, as it would signify a further evolution of the platform. Plus, I gotta admit, I tend to be a sucker for new features in general, lol.