Mandatory Secondary Screening?

As one of the fortunate who possess a valid US waiver (I-194) I have become complacent in travel to the US. I always ensure that I arrive at the airport for pre-screening with more than ample time prior to my departure. If I am connecting through a Canadian city which has US pre-screening I ensure that I have at least 2 hours between connections to allot for what has become a standard (at least in my travels) - the secondary screening.

Having received my 5 year waiver almost 2 years ago this November in my initial travels it was always a gamble whether or not the screening officer would refer me to secondary but in the last year or so it seems that this practice has become mandatory. Here is how it is always played out:

1. arrive at first screening with documents in hand (ticket, customs declaration, passport, waiver document)
2. screening officer reviews documents, reads both pages of the waiver document and swipes passport
3. officer places all documents into a yellow folder and directs me to proceed to secondary

Fortunately I primarily pre-screen out of a Ottawa which is usually pretty quick. When I pre-screen in Montreal or Toronto it can become quite frustrating.

Here is the thing - recently I was traveling with my wife back through the US from a vacation in the carribean. We connected in Atlanta and I was refered by the first screening officer to secondary. After sitting in secondary with my wife for about 30 minutes a supervisor called me up to the counter. He gave me my documentation and escorted my wife and I out. On the way he told me this:

"You have a waiver and therefore you should not be using secondary. You are clogging the system! Next time you are refered to secondary from the first screening officer, ask them to speak to a supervisor. Tell the supervisor that you possess a valid waiver and that you've been told that you should not be refered."

At the time, I felt that this was excellent advice. I completely agreed and thanked the supervisor for this information and my wife and I proceeded to catch our flight. A few weeks later I was traveling the US once more. At first screening the officer was familar to me (as most are out of Ottawa). Rather than ask for her supervisor I proceeded to tell her what I was told in Atlanta. Her response was that every border office does things differently and the guy in Atlanta shouldn't have told me that. From there I was then refered to secondary.

So here's the questions: has secondary become a standard for you? Have you ever asked to speak to the supervisor and if so has it been beneficial?