Hmm. I don't think I've ever been much of an evangelist for accessibility in the "for people who need it" way, although I certainly consider it a Good Idea. However, I've always very much believed that if you Do It Right, especially with respect to separating content and design, then a lot of stuff becomes easy - whether that's showing things differently for somebody with different needs, or changing a design in a few years time, or wanting to do something different with the content...

(Why yes, I do write printed documents in LaTeX sometimes, why d'you ask?)

That said, Doing It Right doesn't always automatically make things accessible, and while I don't put much effort into learning about accessibility needs myself, I'm usually very happy when people tell me "doing x would make things better" to do x.