As someone who has traveled extensively with and without GE, your experience is extremely atypical. Not just for myself, not just for people I am acquainted with, but for all of the people I see in the customs lines and watching the speed of the lines. When I was dating a woman who was not a citizen, if we were returning internationally she would have me go through the GE line to go get the car, etc., and I would regularly have gotten through, walked to the car, loaded my luggage, and driven back around to arrivals and still had time to kill while waiting for her to arrive.
This is perhaps the first time in my life I've heard of someone saying that they haven't seen a difference after acquiring GE.