Some features are meant for the advanced users, some for the lazy.
The mouse "Snap To" default button option is so poorly implemented (in Windows at least) that it is potentially dangerous.
I enabled it for some testing. Later I started a print operation, but for some reason the print dialog box took ages to appear so in the meanwhile I shifted my attention and the mouse cursor to the 2nd monitor doing other stuff... Guess what... While I was looking at the 2nd monitor the print dialog appeared (on the first monitor) exactly as I was about to click on something, so I clicked blindly at the OK button and the print job started with wrong settings...