:I usually removed only those spoiler templates in sections that were clearly marked as containing a plot summary (so a warning that information about the plot follows is insulting the reader's intelligence) and on reasonably old pages. Encyclopedias do not carry spoiler warnings, and to see them used in articles about works that have been published long ago makes my eyes bleed. You might also be interested in Wikipedia:Requests for comment/Policies/Wikipedia:Spoiler warning, a current discussion of these topics.