What isn't easy about installing from the disc given when you bought the mac? Don't have a your mac discs anymore? Download it or borrow someone elses. If you don't want the extra crud of iOS firmwares, disable it. To be honest it's quite "easy" to install for any user.
Quick on the other hand, how many 4.5gb installations are quick?
I think the point wasn't that a 4.5gb installation should be quick. It was that it shouldn't require a 4.5gb installation if all you want is gcc. More like a 50MB installation.
Quick on the other hand, how many 4.5gb installations are quick?