This thread has inspired me to roleplay a character who is slightly deaf. In the heat of the battle, with swords ringing off steel, enemies howling in pain, and heroes bellowing out warcries, and the warlord in our party shouts out a tactical-based power, my PC will have to say "What?" and the power won't work.
Because at the end of the day, sometimes someone could be reminded that the PCs don't have an omnipotent bird's eye view of the battlefield, and that it's OK not to be perfectly tactical 100% of the time.
Nobody's claiming that though. There's a world of difference between perfect tactical play 100% of the time and completely ignoring tactics.
There is a fairly healthy middle road here where a bit of tactical play helps everyone.