> our GHz computers, we were doing previously with old MHz
> systems.
I do also, but then I do have to pinch myself and remember some of the cutting edge software that really does make use of the hardware - i.e. games, video editing, neural networks, etc. I know we could already do these things on lesser machines, but there is no doubt that the level of which they are currently done could not be replicated on a lesser machine. And also remember the efficiency of systems such as web servers, todays average usage would be a DoS attack of the past.
I do look in disappointment though at text editors, window managers, file viewers, etc - that despite having much more computing power, offer not many more features but still eat tonnes of resources.
I'm currently (slowly) working on a Window Manger for X11 which tries to bring back some of these ideas but for modern devices: https://github.com/danielbarry/oakwm/ It's built on top of wm2 (which itself has roots going back to Bell Labs plan9). A lot of the work is in ripping out the unnecessary features and making it touch friendly. The idea is to run it on the PineTab Linux tablet.