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Actually to tell you the truth that is the option I miss the most from Gingerbread because I keep my screen at nearly the lowest brightness so that it does not waste battery like crazy but I am afraid now the quickest way would be to have the power control widget which is ridiculously big and to adjust it from there :'(
Are you sure it's not available? go to menu>settings>display>brightness and make sure auto is unchecked and then try it. It still works for me (but I'm using the ShoStock2 rom right now and the Apex launcher, so it might just be in that.) Worth a try, anyway.
Nope it still doesn't work :/
I took a shot. If it's a deal breaker you could always find a ROM that supports it.

Hey all, I stumbled upon this quick method with 4.0 once. Tap and Hold the top indicator bar, after two and a half seconds, just slide your finger left to right to dim up and down. Much better then gingerbread IMO. Cheers
I solved my problem by installing Display Brightness App. Its free. https://play.google.com/store/apps/...epper.DisplayBrightness&feature=search_result

I solved my problem by installing Display Brightness App. Its free. https://play.google.com/store/apps/...epper.DisplayBrightness&feature=search_result