I am a music professional. I have two studios, both of which use Mac Pros. I can take my MacBook Pro out for on-site recording jobs but those are few and far between.
The ODD is utterly useless for us. We use external drives in our studios that can burn discs if it's absolutely necessary, but most clients receive their finished product on a USB drive or remotely over the web. The only time we ever burn discs anymore is when we have someone who is totally technophobic and doesn't have a computer at home. These people are few and far between.
There was a time when we would burn reference discs to check out mixes on, but that is overly time consuming and carries expenses over time. It's much easier to do a quick sync to an iPod and reference that way--which is how everyone listens to music today anyhow.
In our state this also gets us around charging sales tax. Because we provide no tangible item, there is no sales tax. For our clients this means a substantial savings that they are all too happy to accept.
I guess we work differently then.