I do change things that slow me down enough to be worth the effort of changing them, but, for me, a computer is a tool to get a task done, and it remains handy to be sufficiently used to the standard configuration to be able to use and fix other people's computers. That proportion of the people I know who need *computer* support are more than averagely likely to use a fairly standard configuration in any case.

That does not necessarily apply to those I may help with plumbing, or mending domestic appliances, though.