My opinion is that Zone blocking has it's place in mid-field - to  stretch the field.
Personally I am a believer in the drive block - driving them off the ball.
You never use zone blocking on the goal line, there are certain techniques in the drive block to counter looping and veering.
You can also use "do-dad" blocking or combination blocking with the guy next to you.
I personally believe in drive blocking - some believe in zone blocking.
I guess there is more than one way to skin a cat.