I can't believe Apple has taken away color icons, not only in Aperture, but in iTunes, Finder, etc. The switch to the dull linen sign-in screen was bad enough!
Not only is monochrome horribly boring and ugly, it makes my workflow more difficult. Icons that were once easily recognized by their color must now be searched for!!! This is especially troubling to those of us who are not as familiar with Aperture's icons as those with more experience. I feel especially sorry for those just learning the program. Colors made it so much easier to recognize and distinguish between folders, albums, and projects.
For the first time ever, I am very disillusioned with Apple. It feels like we've gone back to the dark ages! Didn't it ever occur to anyone at Apple that those who love photography and the wonderful world of color might be less than happy being cast back into a monochrome world? Please at least give us a choice!!!!
I am so appalled by this change that I am seriously considering going back to using Lightroom with it's wonderful dark interface, even though I would sorely miss many features in Aperture, especially it's slideshow feature. It would also be hard to get by without Photo Stream, but I'm sure there must be some workaround. At any rate, I just downloaded the trial version of Lightroom 4 and it looks wonderful in comparison to Aperture and all of it's monotonous grey!
P.S. I saw a good analogy posted somewhere on this subject asking how you would like to try finding your car in a parking lot filled with only gray cars! That's pretty much how I feel using Aperture, Finder, and iTunes these days!!!