The hidden costs of decisions

Are there hidden costs of making decisions?

Kinda hard to say no to that.  The biggest cost of developing and support product is time.   No matter how many tools or processes we have, in the end, the cost comes down to time--it takes time to implement and support tools we use etc....Which leads me to my next question?  Then why do we, as in software engineering as industry, skip processes like data driven design or OOP?

I hear this statement a lot:  "We need to get this done now.   We can revisit it later." And yes, while that is true, do you understand the cost of that?  

Too often, short term decisions like "We need to get this done now" means higher costs later.  But no one measures it so they never really understand that cost.

What things to do you do to help materialize the cost of decisions?