You are absolutely correct! I am a photographer and have been using a laptop for years. I am looking to get my first Mac, a MBP, in the near future. I am waiting to see if I can afford whatever upgrade they come out with, or I will go with a refurbished. There is no "one" computer system that is "one size fits all" IMO, that's why they have so many options. At some point I will probably also get a desktop with a really big monitor to work on my photography, but for now, mobility and ability are the two requirements for me!
You can always add a monitor to your mbp if you don't need the additional power of a desktop. Large monitors are cheap nowadays. Great pics btw on your site. I'm always a fan of fellow midwesterners.