I started using Mathematica as soon as it was released in Australia, and pretty soon my colleagues and I were using it for our collective research efforts.

One funny incident occurred soon thereafter, when I was on study leave from Sydney at the University of Bath. I wanted to put Mathematica on a computer in the laboratory there, which was run by a fan of Reduce (and not at all a fan of Mathematica). He spluttered at me, “Tell me one thing Mathematica can do better than Reduce.”
I replied, “Its graphics are very good.”
He answered, “Graphics? What are graphics good for? They only serve to mislead.”

I hope that is one view of the world Mathematica has made obsolete.