In the past, laminated glass was usually installed in the windshield, with side and rear windows being tempered only.
The difference is that tempered glass is per-stressed so that when it cracks, it shatters into many tiny and dull pieces. Laminated is the same thing, but with layers of plastic sandwiched with layers of tempered glass. Laminated glass will still shatter, but will be held together by the plastic layers.
In an emergency, small improvised, or purpose built tools meant to shatter tempered glass will be useless if the glass is laminated.
As Mythbusters proved, you wait until the car is almost full of water, and then open the door.
Not quite. There is a period where water pressure hasn’t built up enough to stop you. They were specifically testing pressure equalization, not that you should wait as a first course of action.