I don't inform any more unless they directly ask if I have any weapons. I used to tell cops that I carry. A Sergeant with the Orange County Sheriff's office changed all of that, back in 2000. I was sitting at a stop light for a pretty long period of time, and after about 10 minutes assumed it must be broken. There was no traffic, so I went.
The deputy came up behind me and pulled me over. I still do not know where he came from, I never saw him until he was on my bumper. He asked me to step out of the car, so I did. I handed him my DL, registration, CCW permit, and Insurance. When he saw the CCW, he asked if I had a weapon. I told him yes.
He stepped back, put his hand on his pistol, and told me, "Make one move and I will kill you where you stand." Then he said, "Go ahead, try me. I bet I am faster."
I asked him what his problem was, and he began cursing me out, calling me names, and was a real jerk. Bragging about his 20 years on the force, etc.
I do not tell anymore, and yes I do have things to hide. I don't want people to know what my medical history is, nor do I want people to know details of the sex life between my wife and me, nor do I want anyone to have access to my financial information, like credit card numbers, etc. It is personal and private. No searches for you, unless you have a warrant or are arresting me. Just because I have something to hide does not mean that the "something" that I am hiding is illegal.