Quoting Peter Ansell ansell.peter@gmail.com:
It was a big issue on the mailing list and the wiki, and apart from the one forum link to start this thread, doesn't seem to be a big issue to casual readers.
A solution which requires a user.css action to opt-in to displaying spoilers is focused on wiki users, and leaves casual users who so far haven't said a whole lot, it seems, out of touch, although if they have an account they can utilise the system just as easily.
A few points. First, that thread was actually initiatated by Kizor who is an admin. Second, how would we get any feedback from people about the spoiler warnings? Where do they think they'd go to complain about it?
On a related note, can anyone think of a way to get info from the general public? The best possibility I can think of is to have after the donation drive is over a general poll linked to at the top of the pages. Something like "Wikipedia is doing a poll of its readers about spoiler tags" and then a link.