A few observations:
1. For several months, I was searched EVERY time when flying alone, but NEVER when flying with Mrs. G.
2. I am always searched when I fly other airlines alone (esp. discount airlines) but never when flying UA as a 1K.
3. In March, My wife and I witnessed a toddler getting shoe checks on WN in LAX. This was insane.
4. I agree that this really only gives a feeling of security. Sadly, there are many other security holes in the system.