Oshkosh secrets?

I was kinda sorta thinking about going to Oshkosh this year for the first
time, but from what I'm reading on the net, it isn't the easiest thing to
do. Apparently, the local hotels are all booked a year in advance, and if
you try to drive in, expect to spend a lot of time in line. So, for those
that have been there before, are there secrets? Like: fly (commercially)
into Milwaukee, stay at X hotel 50 miles from Oshkosh, and they have a
shuttle bus that gets to use a special gate and avoid the lines?