Thinking wisely & creatively is not easy, but for some it just comes naturally. What separates them from the rest is perhaps not innate intelligence but the ability it sharpen their focus. To whittle down to the core of an issue and develop a real passion for what you are doing.
For instance doing extensive research on a subject uncovering minutiae and discovering new information that may rattle you to the bone.
People that tend to be smart but scatter brained often lack this ability.
This brings us to the modern day issue of multi tasking... Does this decrease our ability to do be as smart as we can or because we are doing so many jobs at once does this juggling cause many to be a jack of all trades but master of none?