Troubleshooting slow boot performance in Windows
joedissmeyer.com
joedissmeyer.com
I don't get the obsession with boot times - its a rare occurrence.
As for desktops, some elect to turn them off to save power at night.
1. ACPI power saving modes draw very little current. As long as your computer is configured to drop to that, it's fine. It will resume within 1-2 seconds as well.
2. There are companies which have software which manage this and power your workstations up before you get in and down after you've left.