Well I currently live in Indianapolis. For 2017 and 2018, I stayed in my nice little 1 bedroom apartment on the south side of town, approximately 7 miles from the convention center.
I have a pending job change and move up to northeastern Illinois, which is about 4 hours away. I'm still undecided if I will actually attend this year. I had been of the mindset "I like GenCon just enough to go there simply because it's nearby." I mean, in 2017 I went to Will Call and got my badge during my lunch break on Wednesday, because the convention center is a 15 minute walk from my office.
If I do go this year, I guess I'll probably find some outlier hotel, then park at the lot in Circle Center Mall. Maybe for nostalgia and familiarity reasons I'll room at one of the hotels near where I currently live, around the corner of US-31 and Thompson Street. There's a Travelodge directly across the street from me.