As has already been pointed out above, camera gear is not something that security officials ask you to remove from your carry on bag to put in a tray, that seems to be reserved for just laptops and tablets.
In my experience, I've only once had my camera removed from my bag and that was after it had been scanned within the bag, and they then took me to one side to go through it. This was at Heathrow Terminal 5, the security person inspected it and then took some swabs, presumably to check for explosives.
Professional Photographers with large amounts of kit have no choice but to check their kit into the hold. A friend of mine uses Peli Cases, then puts them inside cheap hold all bags, so that they don't look like they are holding something expensive. The difference is that as a Pro, you are going to have all that kit insured, so that if it does go missing you will get it back, and potentially coverage to rent gear to meet the requirements of a shoot. Where as a non-professional may not have specialist cover and find that their travel insurance policy won't cover everything.
In this regard the US is better than Europe, none of these measly 5kg cabin bag limits. As long as you can lift it then it is fair game. I flew with a cabin bag weighing over 30kg, above the 23kg checked bag limit! No one noticed or cared, but it did take 2 of us to haul it up to the overhead bins.
Bit of a sidebar.... Not sure how much time you've spent in Europe lately, but the weight limit of hand baggage tends to be down to the airline. BA allow 23kg for example, where as some of the budget airlines are like 10kg and are far stricter. Ultimately there is only so much weight you can fit in a bag to certain dimensions, which is what they tend to check if its clear your bag looks too big, unless you are filling it with bricks.
In a lot of ways though, I'd argue that the increase in checked baggage costs in recent years is actually quite often a pain. So many flights now you find that everyone has a small suitcase to the exact maximum carry on dimensions, thus there is a struggle to find an over head locker space to put it in, plus the added faff slows down boarding time.