It's the same here in the Kawarthas. Seems to be a cyclical thing, when I first moved here 15 years ago, there were thick beds of pads everywhere. A few years later, they started to die off, you could see floating roots all over the place. After that the pads had a comeback, but short lived. Last year we saw lots of floating roots once again and the pads are far and few between.
I imagine in a few years they'll be back.