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Yes, at one point in time this was a important, though I still do it on my Mac Pro. Two instances of disk utility helps me to burn two discs simultaneously on my Mac Pro. It has its benefits, but most modern Macs these days don't ship with superdrives anymore.

But, what if one wants to watch a movie? Surely, a superdrive would be good for that purpose though. I'd hate to have movie images all over my desktop when I can just burn them to DVDs.

At one point in time, copying cd's was a big thing. Having two drive bays made this easy. It could also be used to quickly burn discs if the machine is used for professional purposes.
 
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