I have a MacBook Pro which I use primarily for photo editing and creating digital scrapbook layouts using Photoshop. I had to make this same decision back in March when my previous laptop was not working very well (was using a Dell running XP). I really did not want to go with Vista and it is difficult to find a new laptop with XP these days. So far, I am really loving my Mac. I use iPhoto to organize / view my photos, ACR (Adobe Camera Raw) to edit my RAW files and Photoshop CS3 for additional editing and digi layouts.
I don't find that I have any resource issues with the Mac, i.e. I can have everything open at the same time with multiple photos being edited with no noticeable drag on the processing speed, which I find to be a definite plus.
The only drawback with the MacBook is the price, but if you can afford it, I would definitely recommend it.