I know I'm being ridiculous. I think a big part of it is I look so forward to our 2 week summer vacations. In California, I have NO desire to step foot off property. Don't get me wrong, I'd love to go to Knotts Berry Farm, Universal, Sea World and Six Flags, but have no desire to drive ANYWHERE in California.
It's understandable to want to plan in advance and a bummer to hit an electronic roadblock more than 8 months out. I imagine it is frustrating, if you are used to planning WDW a year or more out. It's always interesting to me to see the vast differences between the California and Florida operations, and here's another baffling one!
But I have a couple of thoughts here...
If you are worried about driving in SoCal, it's not as bad as you may imagine. Personally, I find the drivers in Boston, New Jersey and a few other big east coast cities (in and around the DC beltway, for example) to be far more aggresive and impolite than anything found in SoCal. The thing with SoCal is that the Freeway Is King, and there are immense stretches of massive modern freeways in all directions. Compared to the old Colonial era cow trails around Boston that grew into pseudo-freeways, SoCal is a master-planned modern miracle. And so long as you don't do 57mph on a freeway but keep it to 65mph or above you'll be fine. And with GPS navigation available from car rentals now, it's nearly foolproof. But, if you live in a rural community and just find freeway travel a problem in any city bigger than a Birmingham, Alabama or a Portland, Maine, then all the navigation and turn signals in the world won't solve that.
That said, Grey Line offers all sorts of nifty bus tours from the Disneyland Resort area to all the popular attractions around SoCal; Sea World, Hollywood, Universal Studios, Knott's Berry Farm. There's even a shuttle bus system called Anaheim Resort Transit that takes you from Disneyland's bus transportation center to and from Knott's Berry Farm for a few bucks, without joining a Grey Line tour. (Route 18 on the ART system)
http://www.rideart.org/route-map/
So then there's non-theme park offerings in SoCal, of which you could easily fill a two week vacation with and not set foot in a theme park once. California was famous as an international tourist destination long before Disneyland opened in 1955, and it has amazing natural and man-made wonders to explore.
All within a 90 minute drive of Disneyland you can take a revolving gondola a few thousand feet up from the searing desert floor of Palm Springs up to the snow-capped mountains at the Palm Springs Aerial Tramway
http://www.pstramway.com/
Or you can visit the fabulously restored art deco observatory and planetarium (one of the finest in the world) at the Griffith Observatory in the Hollywood Hills.
http://www.griffithobs.org/
Plus a thousand other fabulous museums and cultural offerings in Los Angeles; children's museums, automotive museums, science museums, famous art museums ranging from Greek Antiquities to Modern, the stunning Getty Center perched on the hills with a monorail ride up to the top that is all free.
http://www.getty.edu/
Beaches and surfing and swimming and tide pool exploring are a picturesque drive just down the coast from Disneyland at Orange County's clean and upscale beach communities.
http://www.lagunabeachinfo.com/
And in San Diego, just less than two hours south of Disneyland, there's another fabulous bundle of cultural and natural offerings, aside from the world-famous San Diego Zoo, San Diego Safari Park, Sea World, or Legoland. Balboa Park, built for the 1915 World's Fair and perched above downtown San Diego has over a dozen museums and botanical gardens; the Air & Space Museum and the Railroad Museum in particular are big favorites with kids and adults alike.
http://www.balboapark.org/
Or go on a guided tour in a kayak of the sea caves and sea lion territory around La Jolla, a couple of miles north of downtown San Diego. Talk about a fun family adventure that doesn't involve a boat floating past singing animatronics!
http://www.lajollaseacavekayaks.com/
There's a world of adventure waiting for tourists in Southern California beyond theme parks. Disneyland is fabulous, and is perfectly sited to act as home base for a SoCal vacation. But staying "on property" for a week or two really limits you to the experiences you can have.