I am a King's Indian player myself and I know about the Black's Queen Bishop, but I have played quite a few games when I didn't actually manage to activate that Bishop. Of course, it is a "good" bishop, and it remains a "good" Bishop even without moving, but actually activating it is somewhat more difficult. It only activates if there is an attack going on the Kingside. In some variations like the Four Pawns attack where the Black doesn't get to attack on the Kingside that Bishop is actually often traded for the White's King's Knight.
To Develope a Bishop

That is why I specified Classical KID which is just about pure race. Of course you always have to analyze the specific position.

lol...kurogkug, you're not supposed to open multiple accounts.
??? Who are you talking to?

The position in @#6 (a classical KID) may be closed and the center fixed, but the game has hardly slowed down. There is an urgent race going on and time is of the essence. Black needs to break through on the king-side before White breaks through on the queen-side.
Maybe, but mainline Ruy Lopez and classical Kings Indian Defense would seem to be two important exceptions.