Do I have to be concerned about self-plagiarism in a short accessible methods description?
My personal belief is that it's fine to duplicate the text with a reference to the original methods paper and a statement that this is a short summary of that work. Unfortunately, you will find people in the world who think you should be drawn and quartered for doing this, so your best bet is to write two different descriptions lest you get "caught" by a pedant. Worries about self-plagiarism for methodology sections, in my opinion, are vastly overblown, but not everyone agrees with me, so you have to be careful who you work ends up in front of. You never know who is going to run your papers through plagiarism detection software and reject your work because of one paragraph.