I think part of the problem is how quickly you get used to it! I don't feel that my octo is lightning fast any more, and yet when I troubleshoot, I ALWAYS think that the machines are just about broken because they are so slow.
I mean - I'm talking maybe five or six other computers from mac books to g5 duals that I have thought were really sick because they were so slow. All the owners tell me that they have always been like this and I'm off my rocker. And people always comment on how fast my computer is, but I feel like it's just normal, now. Bit sad really.