I like your analysis of the computer in education. It should be treated as tool that makes things more efficient and allows for simulations that otherwise would be unaffordable.
There is a lot of software that can be used to teach art and music. Sure it would be digital art, or it could just be used as a portal to find information and examples about other mediums.
As for music, I think the computer is like the second coming. Software instruments and professional editing tools are becoming more available as opensource programs. These have infinite potential in young hands. It would be much more accessible than lugging a big wood or metal thing around (playing bassoon in middle school turned me off to music) and much easier to scale. All of the same principles could be taught, with the added bonus that kids could make music they find relevant with any sound they want.
What about business and accounting? Most people don't understand credit because they don't understand long term consequences, or how their daily actions sum up. This sounds like a job for a computer game! If you make it fun, kids might actually want to do their homework!
You are right though, the saddest thing is that computers are just being thrown at education like they are better pencils and paper. This makes a lot of people think computers are no good, when really it is they who are no good at teaching.