As an Iowan, I'm surprised we're not already the "wind capitol of the world". You can't throw a rock without hitting a turbine, especially along I-80 and I-35.
As for the few turbines in the urban areas, they're completely unnoticable. They're silent and just blend into the background.
The only thing I could maybe see as annoying is the red flashing lights they use to help aircraft see them at night. The flashing is at least synchronized so there isn't a constant twinkling effect.
I'm also from Iowa. It's a really eerie effect driving through a wind farm in the pitch dark! I noticed it most recently on 80 near Newton when they put in a wind farm in the last couple years.