Oh..okay, sure that makes sense...
Like I told bnelson...so many different opinions on TV..and you mix in my ignorance about all things military..and it makes for a lot of confusion...LOL
I DID enjoy the video of the tanks, thanks.
To add to Karl's excellent response, if you scatter mines about willy-nilly, your own guys are more likely to...find them...than the enemy. That's why mines are laid in belts, with positions carefully noted. (A systemic downside of minefields is that whoever loses is usually not in a position to publish the location of their mines, or to defuse or remove them, making "winning" a potentially dual edged sword).
In Iraq, the IEDs are not laid in fields, they are widely scattered around the country, and often triggered by remote control when a target of interest passes by.
For these reasons and the ones Karl mentioned, minefields are much easier to defeat than an assymetrical insurgency.