There is comfort in knowing. Comfort is fine. Comfort is good. There is nothing wrong with being comfortable.
Except when you are looking for passion and excitement.
Discovery, art, trial, error, try again, the journey to "better" are driven by excitement and passion.
As a teacher, what is your goal? What drives you? Comfort or passion?
What drives your students? Discovery or knowing?
The answers to these questions may speak volumes about any potential disconnection in your class. The answers may also explain why your class succeeds where a colleague is struggling.