Originally I didn't but I started using them more and more because I wanted to cover every secret in the games... leave no stone unturned so to speak.

I even gotten into the habit now of using multiple ones at once, since some cover things others don't, and vice versa.

It's gotten quite vexing I have to say... almost like an addiction. I wish I could just play through the game unaided and discover things for myself... it might be less complete but I feel like it would be more fun.