Chromebuck, a pound of draw weight translates into 1-2 fps increased arrow speed, all other things being equal.
Take the top bows in terms of hunter preference, not necessarily design, and run them through a chronograph shooting the same gpp, and you'll see that they're within about 15 fps of each others. (Review Black Schwartz's tests, for example.) Some say that's not much of a difference. It's actually a huge difference. The equivalent of 7-8 pounds of draw weight.
It's not just the newbies who prefer speed. I'm getting a little long in the tooth. Been shooting sticks for more than 50 years. Used to shoot bows in the low-to-mid-60s. Now, by shooting fast bows, I can get the same arrow speed with a bow in the high 50s. As has already been pointed out, faster bows enable one to drop down in bow weight without losing performance. What's not to like about that.
Of course, it's a myth, or maybe just sour grapes, to say that that faster bows are noisier than slower bows or imply they're less accurate. Lots of things contribute to making a bow noisy, and speed can be one of them, but there are lots of others things that have equal or greater impact -- string material, arrow weight, tiller, bow design, etc. And accuracy, of course, rests with the shooter, not the bow.