I've been making fruitcake since I was a tiny tot, my first job was to dredge the soaked fruit for the batter, so that it wouldn't fall to the bottom of the cake. When I got older I got the boat paddle chore, which I wasn't so crazy about -- my mother made so many fruitcakes that we used a washing tub and a canoe paddle to mix the batter. Thing is, my Irish mother's fruitcake wasn't to my taste -- it was essentially straight currant cake, and I hate currants. I switched recipes when I was about 10, to the one my older sisters made, because they didn't like Mom's recipe, either. Mom would eat any kind of fruitcake, it was her favorite sweet -- actually, in our house it was the only kind of baking that was done most of the time. The tradition of making the "cakes" was so important in my mother's family that once I left home she used to call me up and drop me postcards starting in late August, "Have you made your cakes yet?" If I didn't get them done by Halloween she started getting anxious.
The red and green "fruit" really is fruit; it's been coloured for Christmas. I happen to love candied fruit, even citron peel; I keep the stuff in my pantry year-round, and make fruitcake cookies when I'm in the mood but don't feel like going whole-hog. Mine are chock-full of peels, pecans, and ESPECIALLY cherries -- the batter is there more or less as a binder. Mine is so-called "white" fruitcake; no treacle in the batter, no currants, and the raisins must be sultanas.
As to whether or not you come to like it when you get older -- quite probably, because it is a really strongly flavoured item, and older people tend to like stronger flavors. If you are a soaker, like me, the alcohol usually plays into that as well; most kids don't like sweets with alcohol in them. FWIW, my kids love my fruitcake, and have since babyhood, though I suspect that they wouldn't like their grandmother's recipe very much. I don't know anyone in my extended family that doesn't care for fruitcake -- most Americans think we're odd, LOL.
PS: I've also always loved Spumoni!