"The astute reader will point out that there are many 15″ notebooks out there that feature 1920×1200 LCD’s. To this, I will refer you to my previous point: that widescreen sucks for software development and most business purposes."
After rereading parts of the article, I concede your point. He is hating on width, but he also complains about lack of vertical height. I may have been sleeping when I read it the first time.
I agree that vimdiff is great on a widescreen. I like it so much that I do all my development with vertical splits now (instead of horizontal splits as I used to). ^w v
>>two columns of code
And that's precisely why I bought a 20" wide one, to go with my laptop. And it has been great!
I felt that it's not the presence of width that bothers OP but lack of vertical real-estate on the screen.