I hope this doesn't mean Apple are moving away from people in the creative industries. They'v gotten good at making stuff for grandmothers, five year olds, yuppies and programmers etc. etc. That's really impressive and they did a great job.
But I think their roots in the creative industries were always one of the contributing factors to the quality of their stuff. The idea that a mac is for doing things like video editing and music production is IMO a proxy for making it good at other things too.
As a product though the Mac pro targets (not exclusively or exhaustingly) a section of creative professionals: designers, music industry people, video editors. The design choices & margins produce a price that basically targets a 'need what they need regardless of price' segment. They've been doing so for a long time. In the Apple dark ages these people were a big chunk of mac users. You can still see the vestiges of this heritage in modern macs, eg iLife: Consumer versions of what their professional (in that space) users use.
It is if your version of creativity requires rendering large amounts of media. You could render it on a Macbook Pro in 5 days, or on a Mac Pro in a few hours (actual time may vary).
Powerful machines, servers, and rendering farms exist for a reason. A Macbook Pro is not powerful on the same scale of what the Mac Pro should be.
I'm a creative professional. I do most of my work on an iPad 2 during the day. I use Adobe Proto and Photoshop on it, OmniGraffle, Coda Lite, and Apple Pages and Numbers. When I get home, I get my files from Dropbox/Adobe.com/iWork.com, and use my 2004 PowerBook G4 to turn it into an InDesign document, if it hasn't been published on the web already.
I also have a recent Mac mini, but even though it's the beefiest machine that I own, I only use it to view movies.
But I think their roots in the creative industries were always one of the contributing factors to the quality of their stuff. The idea that a mac is for doing things like video editing and music production is IMO a proxy for making it good at other things too.