I think the laser is very useful and really speeds things along. My Bushnell range finder finally gave it up about a month ago so it is time to find a replacement. I think the yardage books can provide a lot of useful information that the laser cannot, but for speed of play (i.e., give me a distance and shoot) the laser is a great option.
There is only two tournaments that I play in that do not allow rangefinders to be used and between a good caddie and a yardage book there are no issues without it. Either way, as long as you can get your number, you are good. I guess it goes down to personal preference but I'm glad they are making more options available.