Moved here 27 years ago. Have horses, spent most time outside, and no one in my family has contracted Valley Fever. (BTW - it is not West Valley Fever - just Valley Fever. "West" is associated with Nile, as in West Nile, which is not the problem here.) Valley Fever is not restricted to our "valley" or even to Arizona.
Before we moved, our Vet warned us about the pets and Valley fever as they can get it, especially if they play the dirt or spend most of their time outside. Anyone can get an anti-body test to see if they have been exposed, but most who do get it just have mild cold symptoms.
Anyone can also contract aspergillious from the dirt/dust too - which is a different fungal infection that comes from the soil - and it is all around you in Michigan. Would only think one would need to worry if you have a compromised immune system or lung disorder. It is kind of like saying you want to come to AZ because of the mild winters and sunshine, then worry about the possibility of skin cancer. Sun Block and hats work well for that threat, just like anti-fungals are available to handle Valley Fever if you needed them.
No matter where you decide to live, there will be something that can be used against it, whether it be the cold and freezing roadways or snakes or alligators, or too much rain, or too little rain, or bugs & humidity in Florida, pollution in CA, hurricanes, tornadoes, earthquakes. . . . A little Valley Fever isn't so bad. Sorry you won't be joining us.