Yes, LOTS of folks here have. They do run an internal bus, but if you miss it, it may be faster to walk to the main stop at HH than wait for the loop. If you have a car but don't want to drive all the way to the race, you could drive to HH and park or have someone in your party drop you there.
There are also lots of other DISers planning to stay there, and we're including that info in our Amazing Spreadsheet(tm) that will go out a bit before the race. I suspect there will be some who plan to drive with room in their vehicles, too.