Simple often isn’t. Spacious interfaces with few controls, artfully placed, may look comforting and inviting (and they often are), but they can also front for a mafia underground of hidden interaction complexity.
I recently heard a respected designer (who shall remain nameless) speaking of what he called an exemplar of simplicity in interface design: the garage door opener. That’s the seduction of simple in action, because it isn’t simple at all. We all make numerous errors using the garage door opener — moving the door in the wrong direction first, pausing the door accidentally, or hitting the button too many times after the door doesn’t respond quickly enough. It’s actually a resoundingly bad interface masquerading behind the innocence face of a single, simple button.