Spaces.
Instead of this
you get this:
which means for me, as I uses 12 Spaces with dedicated applications in three rows and four columns, I have to settle for something inferior called Mission Control, which shows the current Space and the running applications in a sort of Exposé mode (to get full Exposé mode of one particular application during Mission Control you have to use a swipe gesture on a multi touch trackpad) and all the other Spaces, now called
Desktops are on the top, much smaller now than they were before, and only in one row instead of three (or four or two).
I could minimise my Spaces use, but why?
That is what is putting me off from this update (and Apple doesn't care a bit, as there are a lot more people buying it than me not buying it), which is a first since Panther (oh how I miss Tiger and its stability with the PPC Macs).
But that is how it is and that is the way forward for Apple. They are just in the business to make money, and introduce some new paradigms here and there.