For someone who grew up with black and white t.v. a few seconds here and there hardly matters to our generation. Besides I always use "mac sleep" so the startup is more or less instant anyway. I read War and Peace the other month so I'm sure you get my drift?
I grew up with B&W TV too, so I guess we're of the same generation. But I want an SSD in my next iMac, along with USB3, a faster CPU, and better graphics. I figure at this point of my life a few seconds represents a larger percentage of the time I have left than it would if I were younger.