If you are using Unity go to Ubuntu Unity: Making the desktop seriously efficient again
And vote in the poll at the bottom of the page.
This article fits me perfect.
When Unity first came out I didn't care for it and moved away from it, but came back and gave it another try. That was in version 11.04. But now that I Alpha/Beta tested 12.04 from back in December of last year I will never go back to any other desktop. And believe you me I tried them all.