File copy in finder prevents application launches

Here's another question for people to ignore:
Despite MacOS X's alleged pre-emptive multitasking copying files in the Finder prevents new applications from launching. Case in point, I was copying about 5gb of data from my internal hard drive just now to an external drive. I decided to check my email after the copy started, but discovered I had closed Firefox. So I tried launching it. I say tried, because it just bounced in the dock for about three minutes and then sat there like a dead fish, not giving me anything but the beach ball. I force-quit Firefox and tried launching again after the copy was done. One bounce and I had a window and my home page loaded. Applications launched BEFORE the start of a copy job respond normally. I just can't launch new apps. I've used pretty much every version of MacOS X since 10.2, and this has been the way it is in every version. This leads me to assume one of two things to be true:
1. I'm the only person who's ever had this problem and that's why nothing's ever been done to fix it. Knowing my deleterious effect on any piece of technology I own, I wouldn't be surprised. I can never have nice things.
2. Apple is aware that this is an issue but has decided it's less important to fix this because it is so infrequent (and let's face it, hardly fatal) than to spend their time gussying up the OS with useless eye candy so people don't notice the warts.
So my question: How the heck do I fix this? Or do I have to simply put up with it?

I am guessing that the file(s) you were copying were large, which would mean a longer delay between completed copies. The OS is multi-tasking, but various components (such as the Finder) are not multi-threaded. You can see some of the same results with launching large applications, connecting to non-existing servers or opening some web pages. It depends on the application - I hear Leopard has more multi-threaded components.

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