I (plus many others) use the likes of sed and grep every day of our working life! Scarcely thought about? Not at all.
As to the idea of college fresh programmers coming up with something comparable in reasonable time? Hogwash! It would probably take a dozen years while they rewrote the code dozens of times based on increasing experience to fix all their early mistakes.
And during these dozen years yours system would be unusable because so much stuff would break! Try taking a look for grep, sed, and all the other GNU command line tools in your init scripts. Once the basics were available, we would still be banging our heads against a wall because of bugs or missing features. Ever tried to use the Solaris grep and sed commands? Complete PITA!