Its only in the way of youre face if youre a left eye shooter, and even then - theres a 2nd wheel near the trigger button the the 5D and 7D that will do the same thing as the rear wheel 90% of the time. Im not sure whats hidden in 'menus' that youd want to access with the quickness.. Everything I want to fiddle with (Shutter speed, aperature, iso, AF method, metering, white balance, shooting mode) is on the Q screen which is pretty damn quick? Half the items I mentioned also have dedicated buttons on the 7D (AF, Iso, WB)
To say I think Ive made the right choice me would be accurate