It's sad to read about the dev headaches caused by today's poor virtualization environments. I distinctly remember that stuff was no work at all at IBM. It didn't interfere one bit with the actual work of coding on the products. In fact, we really never thought about setups or creating environments for testing or development.

In peer reviews, for example, it was standard to bring output from both the failing case and the working case as printed handouts. Those were easy to generate; just spin up two machines and fix one while you leave the other broken. They can share resources if you like so you don't have recreate everything. That is horribly messy today. Testing is so hard most people don't do it.