While not asked, I thought I'd add to this thread since I've just done my first trip from GRR now that I live in Western Michigan. There's not really a SuperShuttle service like LAX has (where I moved from), & shuttle/taxi GRR-Holland is astronomical from what I was quote, so I actually drove to the airport
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I allocated a lot of time since I've never done long-term parking, etc, but the drive was pretty easy (of course it's not winter yet!) & the shuttle busses run about every 5 minutes from the long-term parking lot. I thought I was going to be there forever & was pleasantly surprised to find I wasn't. The long-term shuttle parking is $8/day or $48/week, and it does take credit cards. There's a dedicated exit line for ccs.
The covered parking structure is supposed to be done in November, which I think will beat the winter snows. Hope so, as my car hasn't been exposed to snow; just beach salt air
Cheers.