PLEASE either bring back the opacity slider or mimic the behaviour of photoshop where you can drag accross the word opacity and it works like a slider. I tried all the alternatives in CS6, using the arrow keys or gestures on the trackpad, that method is slow, and using the arrow keys interupts flow. I even tried using the shift key to increase the increments to a factor of 10 or option increases it by a factor of 2. Its akward and slow.
Yes, rather than being competitive within Adobe across product lines, they should be sharing and incorporating the best and make common GUI to make everything more easily used.
Compete across dept.s for new ideas; then adopt good ideas everywhere it make sense for users; especially when customers use and request implementations.