Getting there just take the bus from BC to the MK. Then take the boat launch over to Ft. Wildnerness.
Coming back you can do the same thing, unless you are doing the latest show. We did that a year ago, and it was past MK closing by the time we were done. They had busses to take the guests to their resorts. We had to share with several resorts (sort of like an ME route). But we got "home". I am not sure if they have busses to go back to the resorts at the earlier HDDR shows or not, they may very well have them available at those shows as well.
A cab from BC to Ft. Wildnernss would probably run somewhere around $15. I have cabbed from many different resorts to many others, and the most I have ever paid was $22. That was from the All Stars which are sort of far out from everything but AK.