I've heard mixed things about nutmeg. Some people say it gives you a high like pot, but weaker. Some say it makes you trip for 12+ hours. Most say that it takes an incredibly large amount to feel anything.

Salvia might be one of the things you're talking about. It's a common misconception that salvia is like pot. Most people who talk about salvia don't know what they're talking about. 90% of people who smoke salvia don't do it right.