Yep I watched all these videos before I decided to go. I also saw a lot of people get stuck. Every person that got stuck did not do one or all three of basic rules.
1) Air down your tires, as well as the tires on what ever you are towing
2) travel during a lower tide preferably during an out going tide. Stay on hard packed sand until you find the area you want to camp. as you can see in that video it was high tide and everyone was on dry loos sand.
3) Don't go any farther into loose sand than you have to. With a 2 wheel drive MH just above the highest tide mark, and don't spin your wheels.
bring a shovel, a good real heave duty tow strap and couple of old through rugs if you do get stuck you can most likely get your self out with very little effort.
As you can see there are hundreds of people out there and 99% don't get stuck but that make for some boring Video so, No guts no glory! Oh and rule # 4) You have to be smarter than the sand!