While I've only started using it again recently, I originally used it years ago to play Beneath a Steel Sky. Back then I'd never heard of it before I don't think. I still remember the old interface, it sure has improved, more user friendly and modern looking.
My first experience with Scummvm started when I got Curse of Monkey Island. I couldn't get it to run on Windows Vista, so I did a quick google search and found ScummVM. When I used it, it worked so well and so simple that it became my primary source to playing Adventure Games.