The long warm-up when starting a cold engine is actually bad for the engine because it prolongs the amount of time it takes for the engine to warm up, and most engine wear occurs when the engine is cold. I used to have a car that had an oil pressure gauge, and I noticed that it took about five seconds for the oil pressure to reach the proper level, so when I start the car cold I give it about 5-10 seconds for the oil to reach the right pressure and then I start driving. I do avoid revving the engine high when it's cold, though; that's probably reasonable.

I avoid high revs when cold thinking the oil may cavitate or something when thick, but I'm probably wrong on that a least when using the right viscosity at the right temp.

Mr. Oil Geek said nothing so much about wear from a cold engine than just more blow by causing fuel, water, and soot to get into the oil, and not evaporating out of the oil if the engine never fully warms up, backed up by some tests of course.