I like Disneyland a lot. My uncle worked there while he was in college and so we got in for free and would go several times a year as a child. I suppose a lot of why I like it is nostalgia for my childhood. It was always a positive family outing.
I also like the visual aspect & atmosphere of Disneyland. The creative detail in that place is amazing. I like the rides, as they tend to be whimsical. I am not a thrill-ride person for the most part, so I much prefer it to a place like Six Flags. I also like to people-watch. Big crowds and lines bug me too, but you just have to know when to go to avoid some of that (off season, middle of the week, late afternoon & evening) and then just accept it as a part of the deal.
I didn't like Disneyworld when I went, but then I was 15 and didn't like much of anything at that age. I was also comparing it to the Disneyland of my childhood and it wasn't going to compare to a place that already held so many happy memories.