evince recently added some features that I now find it hard to live without. The biggest is that if I mouseover an internal link in a pdf, it shows a little preview of where that link would take me - so if I'm reading a long document and the author says "by Theorem 3.3 it holds..." and if the pdf is recent enough for "Theorem 3.3" to be an internal link, then I can mouseover to remind myself of the statement of Theorem 3.3!