Yep. Once you get it you're good. I registered for Global Entry (which includes TSA Pre-Check) and I got my KTN immediately after I finished my appointment. I was flying out the next week and was able to use my TSA Pre-Check without any issues.
Camera, flashes, light meters, and modern autofocus lenses (depending on the size and if the TSA decides to accurately enforce this) will all need their own bins. And many pro photographers carry multiple cameras, too.
Lol. I must have always traveled to the US airports where they were trying this out as I can't remember the last time I wasn't required to pull my laptop out.
That's weird. I fly a few times a year between Europe and the US and always have my laptop with me in the cabin. I just did so less than a week ago.
A couple of weeks ago it was in all the news in Spain. The news specifically were that "this new regulation is coming into effect today". I just checked and it seems that they were wrong and in fact it only applies to the new security measures and you can still bring your laptop/console/kindle into the cabin with you. This was in all channels 2 weeks ago, what a bunch of incompetents.