It's handy when you need it. Put someone on speaker, go to the net, look up the time of an event. That said, I don't do it enough that it really matters.
There's too many comma's in that process (or: too many steps) for me to consider it to be a serious problem.
// edit: for whoever downvoted me: The more steps it takes to reproduce an issue, the less likely someone is to complete all the steps and run into it. The OP listed three steps, that will only happen under rare circumstances (people don't normally go to concerts every day).
My wife travels a lot for work, she's constantly using google maps on the iPhone to find directions while talking on the phone to the person she'll meet. She's not very technical, she just does it without thinking about the steps involved because it isn't really very complicated when you do it.
