Granted, we didn't go at a "peak" week, but I'm fairly certain you won't have problems driving to/from the resort. It's a cake walk, really. Everything's easily accessible from Buena Vista, which is the 1 street you'll hit coming out of WBC. Even if you parked like the Griswolds, there's always a tram less than 5 minutes away to whisk you straight to the maingate. As for crowds, you may want to get a subscription to touringplans.com which will show you when you should go to each park based on crowd, even during Xmas week. For the cost, location (far better than AKV) and amenities, it's hard to beat WBC.