Having learned to ride and owned Japanese bikes much of my early life, I prefer the single switch. Even my 1982 RS has one, and jumping off of the 2010 GS and onto the RS can require my brain to rewire itself. My thought is, why three separate switches to perform one function?
IMHO to build a successful single switch it needs to incorporate the cancel function, return to center automatically, be easily "thumb-able", and have good feel so you can identify operation through touch. Without any single one of these features it's a failure.
Oh yeah - the horn button on the GS truly sucks.
Life's not too short. It's just that you're dead for so long.