I agree with the content of the article, but there's one key secret that seems next to impossible to find without cheating. To my knowledge the entrance to Kraig is the only place in the game where there's a secret in an elevator room. If you fail to explore the elevator room, the story won't ever move forward. Here's a picture:
http://cdn.wikimg.net/strategywiki/images/d/df/Super_Metroid...
Shooting a super-missile at that block eventually leads you to Kraig.