Waving your hands in front of your computer is goofy too. :)
Gloves would give significantly greater control, flexibility, and functionality. Three examples:
1) Control: Since the computer is aware of my digits significantly more complex movements are possible. With two hands you'd have a ton of customization.
2) Flexibility: I can do all actions sitting comfortably from my chair. My arms don't have to leave the arm rests. Or, I can be across the room swiping through my media or photos.
3) Functionality: Fingers, or motions like raising a hand, could act like key commands. Want to submit a password? Turn your hand like a key. Want to refresh a page? Drum my fingers. Want to clear the screen? Slide my hand across the table. None of these would be possible with LEAP because each would be obscured by or outside of the field of view.
Similar tech seems to already exist in Microsoft's Kinect. It can also cover entire rooms, but would do so more usefully. And the technology is already there to identify human hands, skeletons, and faces.
I want amazing technology just like you, but we need to be willing to not trumpet bad ideas just because it could be cool given enough effort/marketing.