This also comes in handy for wildlife photography. Trying to hold a camera's long zoom-lens up to your eye for long periods of time while following a bird in high tree-branches, one that's hopping from branch to branch, can become an arm-and-neck-muscle-exhausting experience. But if I use an articulated LCD viewfinder and hang the camera down to chest or belly-level I can follow that bird for hours if need be until I get just the right shots. If most of your photography will involve daylight levels, don't hesitate to use any of the smaller sensor superzoom and compact cameras that have an articulated LCD feature. Their image quality has been rivaling and even beating DSLRs for years, contrary to the opinions of those who are only trying to blindly justify the expense of their DSLR camera gear. Some even rival the image quality of medium-format sized sensors in Hasselblads. Even when that compact camera is handheld and the Hasselblad is on a sturdy tripod while using cable-release, delayed shutter, and mirror-lockup to remove all vibration. http://www.luminous-landscape.com/reviews/kidding.shtml If your photography involves longer focal-lengths in lower light levels, then superzoom cameras still win because they can have much larger apertures at the longer focal-lengths than any DSLR glass.
Some further uses for an articulated LCD that go far beyond the old uses for waist-level viewfinders:
Close-quarters Architectural or Spelunking Photography -- Swing out the LCD and hold the camera's back to a house or cave wall to gain further FOV.
Industrial and Machinery Photography - Holding the camera at an arm's length deep inside some machinery while still being able to view the LCD.
Nature Photography - Use "pole photography" techniques. When the camera is mounted to a long pole you can photograph subjects less invasively, or in situations where the species cannot be disturbed at all.
Landscape Photography - When on a train passing over a trestled canyon, hold the camera at arms-length out the window to get shots rivaling those taken by helicopter or plane.
Event Photography - Holding the camera above the heads of a crowd.
Macro Photography - The instances where this feature can be employed are limitless. Especially for subjects low to the ground or at ground-level.
To describe but a few.