My first trip to DL was when I was 1 year old, I think. I remember going once a year, every year, until I was 7. I looked forward to those trips so much - waiting all year for them. Then we got APs and now go many times a year. But when I was a baby, I watched Disney movies, had Disney toys, just grew up surrounded by Disney. The fascination was there with me from the time I was born, practically. Then with more trips to DL, more Disney movies, I became more and more interested and in love with everything Disney.
What keeps me going back to DL is that it really is my 2nd home now. I spend so much time there. My family goes there often, and my friends all have APs, so we spend lots of our free time there just people watching and going on the occasional attraction.
What keeps me going back to WDW and Disney resorts is that I can completely relax in a fun, safe atmosphere, with some similar things from my 2nd home (DL), as well.