@Paul: it can be used very rarely as a surprise technique but one timeout and the coach will generally figure it out.
You can run a press all game against a team like Townsville in the NBL and they'll cough a turnover up every few possessions while trying the same thing over and over again. It disrupts their entire evening.
If you did it for that long in the NBA you would concede so many layups when the trap gets busted 9 times out of 10. There is a golden age of point guards right now, especially in the West. Double teaming them in the backcourt is exactly what they want.
Even if you run a more conservative half court trap: giving one of those guys two defenders at halfcourt is exactly what they want. They split the double and then they have the whole floor in front of them and a 5 on 3 situation, with two scrambling defenders instead of one.
A supremely skilled, athletic offensive player will generally be able to overcome a supremely skilled, athletic defensive player. There are dozens of elite scorers in the NBA, there is only one Kawhi Leonard. It's so much harder to stop those guys from getting where they want and getting the shots they want than people give them credit for. It's always going to be slower moving laterally (defense) than running naturally (offense), except for the extreme cases of quick, long, athletic wings like Leonard.
The closest thing to pressing that you'll see these days is going to be hard hedging and blitzing pick and rolls in the halfcourt. Which is still a risky maneuver that few teams can pull off successfully (Shawn Dennis has had Townsville blitz lots of pick and rolls since he has arrived, for an NBL example, to disastrous results defensively). Very few teams can pull it off.
A similar approach (a press or trap) in the backcourt is even less conservative than that, and it's going to result in a fastbreak more often than not against elite / smart ballhandlers.