The game that exposed me to roleplaying games was
Traveller. A couple of kids at my school were playing it and I watched the whole session. My parents got me the red box D&D Basic set that Christmas and I've been into rpgs ever since.
Other games pre-1990 that I really enjoyed was Star Frontiers,
Top Secret S.I. and Marvel Super Heroes.
Before 2000 I really enjoyed Star Wars (WEG), Fantasy Trip, and ran a Top Secret campaign for 2 years instead of AD&D.
Unfortunately, I didn't get to play many other games outside of D&D in the 00's because my current group of 9 years has been a D&D only club and my only non-D&D game time has been at cons. Since I'm married now, cons are out.