They are the WORST thing in the world a few weeks in June. We are in the Fair Haven/New Baltimore area and they make me crazy!! You would think after 27 years I would be use to them, but they are so gross!!!!!
I have never complained about them too much, I just keep the lights off in the house, and they really dont come around too much. The only thing that "bug's" me about them is driving at night, they really make a mess of your car when you go under streetlights. They will make alot of mess on your boat if your driving fast at night, lots of black splatters, but if your boat is parked, and not under a light, they really wont stick to the boat, if a few hundred land on it, when they die, they just blow off with the wind, but make sure you've got a good coat of wax on it before they hit in late may early june to avoid little fishfly stains.
We went to Garwoods one night last year during the height of fish fly season. It got dark, the boat was under the lights at the dock, and when we came out to leave, it was covered. We tried to brush them off as good as we could, but there were hundreds if not thousands. We pulled it out at the ramp (with more lights) and covered it up fast as we could (we were doing the heebie jeebie wiggy dance the entire time.) The next day we uncovered the boat and it was like a friggin murder scene. Blood and guts and smashed big honkin fish flies everywhere. We had to take it to the car wash to get them out and I was scrubbing the cockpit floor the next weekend, too. Other than that, I guess they're not that bad...
They're bad when you step on them. They crunch and pop even if they're already dead (I think they only live 24-48 hours after they hatch or something like that). Our daughter (5 yrs old at the time) FREAKED when she walked on them. She was not consoled when I told her they were only bugs (she was wearing sandals at the time).