Interesting. I have definite interests that are outside my musical wheelhouse and it amazes other people when I say I love disco or techno. But I am not personally surprised by anything I listen to.
Same sentiment. I don't love JUST prog and classic rock. I could say stuff like Daft Punk, Hans Zimmer soundtracks, or Bela Fleck & The Flecktones, and that would surprise OTHER people, but certainly not myself.
Usually, if something surprises me, I end up loving it or hating it, and rarely is there a middle point where I dislike it for awhile and come back to it later and love it, though I suppose Marillion is the one band I could cite that fits that bill - I first heard them not long after I discovered Transatlantic and went to listen to Spock's Beard, The Flower Kings, and Marillion, but of the three, Marillion was the one that I could not get in to for some reason or another (both Fish and H eras). Fast forward a few years and I revisted them and fell in love. Did it surprise me? A little, but not any more, as they have fallen into a field of prog that I enjoy these days (though I don't spin them as much as I used to a few years ago).
Now, if you had asked "what is music you are surprised you don't hate", I'd say musical theatre showtunes. I don't like it outright, as in I don't make a conscious effort to listen to Broadway stuff, but I don't dislike it. During and after college, I drummed for a musical theatre workshop course and they put on a show every Fall semester, either a full single show, or a compilation of songs from various shows to fit a theme, and it was always enjoyable and I liked the songs and music, but outside of those times, I never sought out that kind of music.
-Marc.