If a native speaker, in person or in a language learning publication, had stated that "used to" is more common that "would" to talk about past habits, would your native speaker intuition have led you to agree with that statement?Intuitions are fine for confirming something is correct, less so for saying something is incorrect.
Those learned folks at Aston say:
Get into the habit of looking at samples of natural language for insights into how language really works. Learn to mistrust ‘native speaker intuition’, and to rely more on the evidence of what people actually say and write.
http://www-users.aston.ac.uk/~roepj/pjrhome/lex.htm
I think that's good advice and teachers should be telling it to their students.
More:
"Firstly, empirical research is needed to replace the intuitive approach of most Business English practitioners. Secondly, the empirical data collected must be large enough to offer a representative picture of the language it is studying. The small size of research data and inability of the results of these works to be generalised have been noted throughout this review. In order to create a data bank of sufficient size, the use of computer-based technology and corpus linguistic methodology is necessitated. It has been noted during the review that many writers have suggested the need for this approach, for example, Cowan (1974), Pickett (1986b) and Yang (1986). It is, however, not suggested that intuition be done away with entirely, nor would it necessarily lead to a better study if it were. However, the validity of informed choices made on the interpretation of empirical data is of much greater value than when choice of language is made entirely intuitively. One further positive aspect in regard to the use of corpora and computer technology is that they can facilitate work discussed in the final dichotomy, that of research knowledge and classroom practice. "
So, I'd say that students should have a healthy mistrust of native-speaker intuition on what is incorrect as well as on what I claim is correct.