It depends on what you think is "worth it." Yes, c2d is passe amongst the community, but it's still a decent computer.
I use my 2010 13" MBP for playing guitar with Main Stage, running my e-drum kit and a mic into my Apogee Duet for recording in Logic, editing 1080p video in Final Cut, CS5 (mostly Dreamweaver and Premiere, with a little bit of After Effects), and I also play a little bit of WoW, too.
I use it with my 24" ACD when I'd like to emulate a desktop environment.
I use spaces to make up for the relatively small real estate; it's just as easy to flip through workspaces as it is to alt+tab around. True, you can't have as much stuff on the screen at once, but you can work with it.
It all depends on what you're doing. Most people don't push their computers and don't need nearly what they think.
That said, I'm not doing complex Motion and Maya projects on my 13" MBP and yes compressor takes a while to work, but I don't sit and watch the timer when I'm encoding anyway, so for me it's not the end of the world.
But the iCore MBPs sure are tempting and I don't fault anybody for wanting a shiny new one.