That's true for guitars and other low-drain applications, but high-drain devices such as digital cameras suffer from a different problem. NiMH or Li-ion are really the only suitable portable power source for those.

An alkaline battery's internal resistance is such that it can't provide a sufficiently large current, so its voltage drops and the camera shuts down. This is despite there still being energy left in the battery... so if you insist upon using them, don't throw alkalines away when they fail in your camera, use them in a low power device... such as a guitar!!

;o)