Engines now have management systems that warm them up quicker, for example once they start they will run lean. But this isn't done for the purposes of engine wear, its done for emissions controls. They need to get the combustion chamber operating right, and to get heat into the catalytic converter to get it operating efficiently.
The emissions test is relatively short , and i forget the actual numbers , but a few minutes of cold running immediately after starting are responsible for a very large proportion of total vehicle emissions.
This is the reason that almost all engines are being manufactured from Aluminium now. Until the stringent emissions had to be met , thin wall Cast Iron was probably considered to be an overall better option than Aluminium for engine blocks. New emissions laws have almost mandated Aluminium now.