Apart from living in the general area and/or having an AP, because those are given reasons, why do you choose to visit Disneyland instead of Disneyworld?
For me personally, it has all come down to location and cost. I live closer to California and have tons of family in the area. It's simple for me to take a drive down Katella and see my family whenever I go to Disneyland.
It's also cheaper for me to visit Disneyland. 2 of my last 3 trips haven't broken the bank as I spent around $750 to split my hotel & 5-day passes with a friend and barely $200 for round trip airfare. I looked at Disneyworld last night just for fun and saw that it would cost me close to $1000 for hotel with just 4-days in the parks and that would be just my half. That doesn't include airfare which averages around $360 roundtrip.
I have also felt that Disneyland is a bit easier to navigate. Granted I have never been to WDW so I wouldn't know for sure, but looking at maps and hearing from people I know that have been I would rather have the two parks right next to each other with numerous attractions in each over four parks with sparse attractions (at least ones I'm interested in) that are farther apart.
So what about you guys?