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Don't quote me on this, but I was told by an engineer that the only reason for the high rpm's on start up is for emissions reasons only. It's to heat up the cats as quickly as possible as emissions are the worst during start ups. So the reason for the higher rpms is to get the cats warmed up and working ASAP. Not to get the oil heated, although that might be a beneficial side effect. So all that stuff about letting the revs settle to idle is just a psycological bench mark we use to make us "feel" better about driving off.

Now what I've been told about oils is totally different and sometimes a bit difficult to believe. With the tech in oils these days, it's supposed to protect throughout a vast temp range and that includes when the motor is cold. A film of oil on the cylinder walls and all that mumbo jumbo. So unless you start her up and redline your motor, the film of oil that was left on the surface of cylinder/piston rings/etc. is supposed to protect things even during a cold start.

In the end, do whatever prevents YOU from punching babies...