Amiga really made my life depressing, because I saw how a computer should work, which, much like my experience using BeOS, was more or less fluid.
When ever I upgraded, I could tell I had upgraded, and even the most minor updated seemed to go a long way...
...then when I finally broke down and bought a Windows machine, the depression set in. Naturally, as everyone knows, in the Windows world, Windows updates as the hardware updates, making sure you never get any use out of those extra resources.