My first exposure to Pro/E was when the industrial design firm I worked for hired another engineering/CAD firm to build several of our designs in Pro/E for a client. This would have been around 1994-1995 in the northern suburbs of Detroit. The consultancy had taken over an old styling studio and the round 'turntable' rom was where the pro/E guys worked. It was a windowless room with no overhead lighting, only desk lamps. At the time it was thought that lower lighting was better than overhead for computer work. It was like a cave.
I remember being fascinated by Pro/E, but didn't get to see much. Not sure what version it was. It was 1996, though, when I started on Pro/E rev. 16 (18 was out) with a new job here in Columbus.
It's interesting how little, visually, Pro/E changed from that rev. 3.0 screen shot to what I remember of rev. 18.