Someone on Ask Metafilter was asking about playing old Sierra games, and one of the answers pointed out that if you just want to see them again for the nostalgia factor, there are walk-throughs on YouTube.
Whoa. Here's King's Quest 5. I guess I didn't play this one, but I surely played others in the series, as well as Police Quest, Space Quest (remember that space burger stand?) and Leisure Suit Larry.