There's reasons for this. Modern software is doing a lot more, and we now have plenty of resources to waste...
I'd like to learn from the stand-outs in the field right now, so I'm wondering, in your anecdotal opinion, what are some pieces of software that exemplify "responsiveness" -- quickly loading, editing, saving, or otherwise reacting to users?
Throughout all that, almost always the perceived delay between me hitting a key on the keyboard, and having it appear in Word, is zero milliseconds.
For text, Notepad++ has always been pretty snappy on all the points you mentioned.
If not, Q/Kdb[1] redefined my notion of "economy" in the sense of resource usage. The whole environment with about 60% of what you'd expect is like 500kb?
It's also very very fast, processing millions of records a second. It changes the way you iterate on things when you can get results back instantly.
This is one of the few software packages I've used in the last couple years that stunned me with speed. Most people are too lazy to care.
Q/Kdb is far from perfect, but you didn't ask for perfect. :)
[1] https://kx.com/