Honestly, I'm not even so sure I fully understood Steppenwolf. What really stood out for me was Harry Haller's disgust of the normal, everyday monotony and especially the desire to kill himself simply because of the fact that he just didn't care to trudge through this monotony. I was under the impression that there was a whole lot more going on in the story than that, but I didn't really get all of it, I think.
When I was really into novel reading, I read a whole lot of fantasy, like Redwall and Dragonflight and some Animorphs. As I got older, people insisted that I would love science fiction, but by that phase I was much more interested in philosophical novels (one in which the main focus was advancing a philosophy, like a typical philosophical text, but in a more narrative sense). Now I really only flip through novels for a couple of scenes to get a feel for the perspectives or the humor or the dynamic of the story. I mean, I could definitely pick up a novel and enjoy it, but I've found I enjoy the animation of film much better.
I think it has a lot to do with me stopping for a minute to follow tangential ideas the story brings up, then never really caring to get back to the story itself. With film, I feel much more invested in the characters I guess. I actually watched a French film called "I Loved You So Long" about family drama just yesterday, and I think so much of the emotional detail captured in film is difficult to convey in a novel interestingly until the reader has had lots of experience with that culture or that type of situation. Having spent so much time in books during my childhood, I think lots of those details don't go beyond reaching an intellectual level for me.