Sprint's Spark Phones Don't Support Simultaneous Voice/Data
Top message: LOLZ by Versed
Replying to: Re: LOLZ by Magnagarde
It's also downright useful if you're on a speaker phone and looking for directions or looking up some information.
I do agree though, it is an over-hyped feature. I'd tentatively lay the blame at AT&T's feet, as they trumped up the fact that they had the feature and Verizon/Sprint didn't on the iPhone 4/4S as a selling point.