I'm waiting for the 2006 edition of the Unofficial Guide to come out in September. The UG has aproximate commute times, both by car and bus, from all of the resorts.
I found a copy of the 2005 edition at my local library, but I turned it back in last week. You may be able to find a copy in your library. I highly recommend it.
I buy a copy before every trip. Since I'm going in December, and the new guide comes out in September, I have been using the library copy for planning this time.
As I remember, AK had the longest average commute times to the parks(other than AK obviously), but they still were not inordinately long.