Paul,
I still vary mine from 30-60, when and if I can (harder on renovations than the new course design, I agree) Or, probably to 50 yards, since 60 is just an invitation to be narrowed.
I can only gauge interest by random comments from golfers. Certainly, many prefer a course with a theme, like small greens, wild greens, narrow fairways. But I do notice that better players notice holes with different size greens or different width fairways, such as "I know I can bust one on 6, the fairway is 50 yards wide!"
I used to design a wide fairway with some rumples on one side, and level on the other, so the thinking player would have an advantage with no visible hazards. Invariably, the superintendent mows the lumpier part as rough, but it may be the pro shop, as in, why would a fairway roll so much?
I guess in practice, rough is the cheapest way to test tee shot accuracy, and many probably default to that as a standard.