Honestly, if Thor were taken out of the equation, not much would've changed for me. I was initially a Spider-Man fan more than anything else. Then Spider-Man started getting stale and boring to me as I grew up. My love of mythology in general drew me to Thor, and then Thor's given me a great appreciation for a lot of Marvel's cosmic elements. So I guess I'd be less into cosmic stuff? But the Avengers are my other great love at Marvel, and I'd still be into them because I got interested in them before Thor with Avengers West Coast, the Vision, Hank Pym, Wonder Man, et al. The Black Knight and Captain America were my inroads into the main Avengers title because Thor was largely absent during Bob Harras' run.
Granted, without Thor my interest in superhero comics as a whole might have degraded more over time. He's the main thing that keeps me coming back to Marvel, especially since Bendis took over the Avengers franchise. If everything else is s***ty, I can usually depend on at least one good comic that's in some way related to Thor: Dan Jurgens' run in the early '00s, Oeming's "Ragnarok" and mini-series, Incredible Hercules, Journey Into Mystery. Those are the comics I'm most drawn to. Other things I pick up mainly because some good creator's on them or I'm interested in the premise or I just want to stay up-to-date. But I guess, now that I think about it, those Thor-related comics are the linchpin of my comic buying.