VW's make difficult the most common method of locking one's keys in the car by eliminating the function of the driver's door locking while open. Despite this, a few owners still find ways to lock their keys inside (the driver's door locks when closed, so closing the locks manually, or with a remote, or from another door's buttons with the keys inside - or then putting them inside, will do it).
For many years I never understood how so many other car owners locked themselves out- until (after helping dozens get back into their cars through various methods), I realized you can just get out, push a button or depress the door lock pins, and be locked out in seconds. As a lifelong VW owner, I've never been locked out due to the system VW uses.
As for the difference in time and effort between hitting the button and inserting and turning key, I guess we all have a different sense of these things!
For your '97 Passat, you should have at least one remote that allows you to lock up without using the key.