I have some people who send me corrections via PDF annotations and notes. Neither Evince nor XPDF fully support these. Highlighted annotations particularly, Evince shows the highlight but doesn't show the annotation text (no icon to show it, hovering doesn't do anything either). I need Adobe Acrobat Reader for that.
My Poppler is a bit out of date, though it's not clear to me whether more recent versions of Poppler support highlighted annotations fully: