Same here - I prefer science fiction and horror to non-fiction, and, generally, older fiction to modern (I like the way the language was used in the past better, for some reason, the way things tend to be under-stated.)
And I also enjoyed imaginative play (although my choice of imaginative play was certainly always strange by my classmates' standards!)
Although, I believe I always preferred to build and make things - I enjoyed building forts and castles and that sort of thing much more than actually playing in them, although I certainly enjoyed imagining the things that could be done in them as I was building them. I would use building blocks and cardboard boxes and other things to build castles and cities that covered the entire floor of my room, or covered an entire full-story flight of stairs and part of the hallway above. Or, I'd use a half-dozen blankets draped over furniture to build tunnels and caves, and sit inside very still imagine the things that would live in the caves. Or I would dig huge sunken cities in sand or dirt for my toy soldiers (and later the Star Wars and G.I. Joe guys.)
I think my brother and sister actually enjoyed playing in these cities and things, but about 90% of the fun for me was in building them. I like to think this took a great deal of creativity and imagination, but perhaps that sort of hands-on building is the sort of thing that the shrinks are talking about when they say "unimaginative play"?
That reminds me, too, of how when I was about 8 or 9 years old, there were these two blankets at my grandmother's house that had these white strings that were very easy to pull out of the fabric and unravel. Left alone for a few hours, I pulled all the string out until the blankets fell to shreds, and tied the string in a huge, elaborate 3-dimensional spiderweb all around the room, wall-to-wall, floor-to-ceiling as high as I could reach and find anything to tie it to, to furniture and doorframes and so on. And then I sat perfectly still, tuned everything else out, and stared at it and imagined what it would be like to live in a world of spiderwebs like that, traveling from string to string. I don't remember the walls or floor or ceiling or furniture or anything, just my mind and those strings drifting off as far as I could imagine into the distance.
My grandmother walked into the room to see what I had done, went totally ballistic as she made me "snap out of it" and try to realize what I'd done to her room! I didn't see or hear her until she started shaking me. I think she decided that I either did it because I was out of my mind, or to be cruel and disrespectful to her and her house, or perhaps a combination of the two, but in any case she was hysterical over it. I was vaguely upset because she was mad and screaming and swearing and crying, but mostly very, very sad and distressed because she was tearing the beautiful string spiderweb apart, with the appalling result that I couldn't imagine traveling along those strings to whatever empty infinities they might have pointed to anymore.
Yeah, well, as I said before: my version of imaginative play was definitely not to anyone else's taste.