From an article with an interesting, if arguable, perspective:

“User Experience” has not changed much in two decades. Due to bloated code that has to incorporate hundreds of functions that average users don’t even know exist, let alone ever utilize, the software companies have weighed down our PCs to effectively neutralize their vast speed advantages. When we compare strictly common, everyday, basic user tasks between the Mac Plus and the AMD we find remarkable similarities in overall speed, thus it can be stated that for the majority of simple office uses, the massive advances in technology in the past two decades have brought zero advance in productivity.

And that’s just plain crazy.

Read the full article here: 86 Mac Plus Vs. 07 AMD DualCore.