Weirfan
It will not take more time than hitting TWO provisional balls (or more)... and you should remember that you lose the drop-and-two-stroke-penalty option if you choose to hit a provisional ball.
In most situations it would be to your advantage to use the new rule. The only exceptions I can think of is if you snap hook or shank one off the tee and lose it, or go OB or lose it before you make the corner on a dogleg and trees prohibit you from cutting the corner even if you can drop it on the fairway.