Does using the wagon let you bypass monsters or are you still essentially moving normally excepted the amount of spaces you can move is "infinite" for that turn. I suppose then you can at least bypass monsters using a longer route if its available , right?

Using the patty wagon is basically teleporting in all senses, just drive past those monsters. Use it to go to other boards without paying... its a pretty handy thing.

Yeah, essentially it's a teleporter

It's a teleporter: you only have to deal with monsters on your start space and on your end space (assuming you evaded everything in your start space).

The wiki should probably be edited. It consders only monsters on the arrival; but clearly, since the PW is to be used instead of normal movement, you should actually be able to move, hence, evade monsters also on the starting location.