Aside from being a robot anime fan, I was rather similar to a blank page before I knew of Touhou, so Touhou pretty much shaped my personal tastes and interests. Touhou showed me that life as I have known it up until that point isn't just about giant robots fighting and saving the world. For the first time, I became interested in female characters, which eventually led to Touhou shaping my taste in female character design (I can't seem to like any other female character that isn't a Touhou character).
After learning Japanese and getting exposed more to the Japanese side of the Touhou community, I came into contact with lots of diehard fans of the series who have been following only Touhou for several years, even up to 10-20 years. I admire them a lot, and so I became even more attached to Touhou. I enjoy everything about it, the games, the print works, the fan works, the community with its annoying memes, everything.
I think I'm gonna stick with Touhou for a looooooooooooooooong time. It's been over 6 years now, and that number will definitely increase.