I am sorry that your accommodation has been changed. I am sure the property you have been allocated is nice, but obviously there will be disappointment as you are not where you expected to be.
I believe Vista Park is on the 27 south. I looked on google, and would say it is 15-18 mins driving to AK. (where as WH is about 7-8). It should be nice an quiet in that area, but it is a longer drive home. If you wanted to go out to eat, there are some restaurants on the 27, just north of the 192 intersection. There is also a 24h Walmart there for groceries etc. On the 192 on the way to WDW, there are loads more restaurants and grocery stores. You would have been closer to these if you were at WH, but they are on your way to Vista Park.
Generally properties at Vista Park are cheaper to rent (less HOA fees and cheaper properties due to the location), so hopefully you will be getting a refund from Virgin because of that. If they haven't offered, you should ask!
Just a comment/explanation on the statement "that there was a contractual dispute with WH" - unless I am mistaken, WH operates like every other STR rental home community out there in that the HOA looks after the community but is not a rental center (like a hotel would be a rental center for its rooms). Each home is owned by a person or family like you or me and they rent them out to cover their costs. Each home should have a local contact (usually a caretaker or management company) and they look after the home itself. Some Management Companies obtain rentals for their clients through various means, including contracts with tour operators. So any 'dispute' would be with the MC or the company that obtains homes for Virgin. It may be a contractual dispute or it maybe that they don't have enough homes available for TO bookings (the amount that an owner ends up with for a TO booking after everyone has taken their cut is peanuts!)
I would say, try not to let the change of accommodation spoil your holiday. "Go with the flow" was something we adapted to very quickly after our 4 week trip around England, Scotland and Italy last year. There were lots of little things that happened that we could have let ruin our trip, instead we saw it as an adventure and took things in our stride. Sure, things didn't go 100% as planned, but we still had a great time and saw a lot.
Have a fantastic time! You will be at WDW, what is not to enjoy!
-Kay