I am in southern California, too. I, too, make frequent DL trips. I bought at VGC and if I had more money, I'd buy lots more.
My family does vacation in Hawaii, so the new resort might be useful to us. I have been to WDW once and may or may not go back. We pretty much have everything in southern cal that they have there - it is just spread out more and not always a Disney theme park, but the only thing massively different in WDW was Epcot.
The downside to owning VGC is that it is hard to get a room on short notice. I can book at one of their other hotels since I purchased direct from DVC. If you buy resale, you won't have that option.
Depending on how much you like to travel, DVC has another resort in Vero Beach, FLorida (but we have lots of beaches here, so not sure how useful that will be) and also a resort on Hilton Head Island in south Carolina which sounds heavenly.
My only regret is that I didn't have more money to buy more points when VGC weren't sold out. Right now, you can get on waiting list to buy from DVC, but they are charging $120/pp. That is an extremely high price for a resort with limited availability.