What do you do with your loose coins?

I have a change purse in my pocketbook that I put my change into that is separate from my bills.   I do not always take the time to dig out change when I am paying for my items at a store.

My husband will let behind all his change except quarters and a few dimes.  We have a large crayon bank that we put our change into.
  
My question is this- Is it wise to always pay with bills only and save the change to take to the bank and put into a savings account? 

Is this a way to save or is it not being "thrifty" with my money?  I have my coins and if I don't use them, I will actually have less money to spend in my budget.  Let me know what you do with your loose coins.