While I do agree that computers play an increasingly important role in research and development, it's not the computer doing the design work. The human is doing the design work, and using the computer to verify the design, or optimize it within very specific boundaries.
When the computer calculates that a certain structure is stronger than it needs to be, the designer can adjust it. The computer won't design a completely different structure for you.
If you were to use a computer to generate a design (say, circuit board or application specific integrated circuit (ASIC) layout and trace routing) it's really just running a semi-brute force algorithm, optimized by the programmer to produce suitable but possibly sub-optimal solutions quickly.
Without the engineer staring at the screen, the thing would just sit there. Saying the computer designed the bridge is like saying the space shuttle was designed by the pocket calculators. The computer is a tool, and it requires and intelligent and knowledgeable engineer to produce anything meaningful.