Does a buckled wheel matter...?

Might be a silly question but here goes....
I was wondering today, does a buckled wheel really affect Mountain bikers that much at the speeds we travel....
I don't mean massively buckled here, just slightly...
On a car at 70mph I can understand it would matter, but at 20mph on a bike?!?!
In the old days a buckled wheel would mean that the brake blocks would constantly rub on the rim causing resistance = harder work and slower speed... but with disc brakes does it matter anymore?
I was wondering today, does a buckled wheel really affect Mountain bikers that much at the speeds we travel....
I don't mean massively buckled here, just slightly...
On a car at 70mph I can understand it would matter, but at 20mph on a bike?!?!
In the old days a buckled wheel would mean that the brake blocks would constantly rub on the rim causing resistance = harder work and slower speed... but with disc brakes does it matter anymore?
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Due to the fact that wheels are not made for lateral forces that are across the spokes that would be generated from a buckle, but i could well be wong
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Parktools :?:SheldonBrown
I noticed the rear snaking around on tarmac, and a strange traction noise, so I got it straightened.
And yes, a buckled wheel doesnt make any difference to your disc brakes, as this is from the hub, not the spokes/rim.
Took it in this morning to be fixed anyway, but just wanted to raise the matter....
Now rolll on Saturday