A properly-configured SSD-based laptop running XP or some linux flavour can easily boot in 10 seconds. Similar improvements are possible in Vista and 7. Are you trying to say that's not beneficial? What about when you are out and about and you need to make a quick tweak to a word document, or a presentation? Or if you're at airport security and someone asks you to boot your machine up to make sure it's not a bomb? With suspend-to-disk it's even quicker, as you rightly pointed out.
And that's ignoring all of the other benefits - less chance of failure, cooler, better battery life, more shock-resistant, etc, etc