Not in Northern Wisconsin, but there are plenty of yak-musky fisherman here in Ontario. (Probably because the bass season is so short
) I have landed several in the mid to upper 40" size. The 50" mark has been broken at least 3 times that I know of by yakfishers in Ontario.
For many reasons, I think a yak is the ideal craft for pursuing musky. It certainly allows you to pursue them without having to use such heavy equipment, especially when trolling. The fact that the yak "gives" means that your equipment isn't getting beat up as much.
I threw "musky" lures - huge stick baits and massive inlines - for a couple of years. After catching most of my musky incidentally on bass lures, I have settled on spinnerbaits (slightly larger than typical bass spinnerbaits) and 4-5" plastic swimbaits as my preferred presentations. They are much easier to throw all day, don't require a broomstick rod, and have the added benefit of catching bass and walleye when the musky aren't hitting.