A comfort zone is exactly that. A cocoon, a warm fuzzy blanket where nothing unexpected happens and everything goes to plan. There is nothing inherently wrong in enjoying these moments...in fact it could be argued you should enjoy and appreciate their simplicity and embrace them for what they are.
Also see beyond, the thoughts, feelings and fears that tickle away at the corners of you mind...

Life is a continual exploration both physical and mental, from the crazy moment we emerge from the warm bubble of our cocoon into the reality of the universe. We are born to live and grow....true life and true growth comes from pushing those boundaries, from taking a tentative step, through embracing and expanding our comfort zone and ultimately enriching our life and the lives of those within it.