We think in two modes
Humans have two basic modes of thought:
System 1
System one operates automatically. Doing fast calculations and quick judgments. System one is imperfect. Snap Judgments are from System 1.
System 2
System two is calculating, but fundamentally lazy. Following Checklists or procedures requires engaging system 2.
Each mode has its purpose, its strengths, and its weaknesses. See their respective notes.