Where are you doing these things?
My point is most people would have wifi where they would do such things. Unless you're in the back of a cab in NYC.
And the GPS still will, just don't use the Sprint Nav and you're good. Sprint's nav doesn't cache the route.
I do it all over the place, lol. In my mind, that's why I buy an expensive smartphone and pay for an expensive data plan on it- so I can do that kind of stuff whenever, and wherever I want.
So, for example, if there is a big game on and I am stuck at work, I can watch it on my slingbox. Or even if there isn't a big game on, I like to listen to online radio without it stopping every time I get a text message/tweet/facebook message, etc.
If I'm riding with a friend and trying to plan my evening with my wife over the phone, I like to be able to do it without hanging up and calling back.
If I'm at the DMV waiting (which can take hours) and I start watching my slingbox, it sucks when it stops every time I get a text message/tweet/facebook message, etc.
If you've had Sprint for a long time then it's probably no big deal to you. But I would guess that anyone coming from AT&T (and had a smartphone on AT&T) will probably miss simultaneous voice and data just like me.
I'm glad Sprint is fixing that issue with the launch of 4G. But I can honestly say I missed simultaneous voice and data almost immediately when I dropped AT&T and moved to Sprint.