It's not that crazy, actually. I was doing tech support ten years ago (so it's 1. ten years ago and 2. just tech support) and I had 3 monitors. Ok I was playing CounterStrike on one and browsing the Internet on the other so I only really needed 1 to actually work but still...
Plenty of people used multiple monitors back then. Just not in the ridiculous multitasking 3D cube interface that bears no resemblance to Microsoft Visual C++ 6, which is what I was using at the time to do my job.