Small examples:
* When I first opened my accounts there was a (required by law, afaik) probationary period where checks took ages to clear. Since then, all my checks clear the moment I deposit them through the drive through. Typical checks are in the $1000-$6000 range, out of state. (My parents use the same credit union. My mom thinks she remembers a check deposit taking one business day--once.)
* Transfers from PayPal seem to clear a day faster than they did with my bank.
* Overdraft protection from my savings account is free and automatic.
Being a part of a credit union is a different experience from depositing money at a bank. It's similar to the way you might feel different even about some big, "faceless" corporation if it was one you'd chosen to make a significant (to you, if not them) investment in.