I had the same with b1. The commons one I've seen are:
subsystem/system (debuging lines)
HIDEvents (Large, multi-line dumps)
UserDefaults (multiple back-to-back dumps)
It really makes it hard to debug an app, we all can agree on that.
Edit: Worst part is, you don't even have to be customizing any of these in your app. They do it from day 1 on a "Hello, world!" build.
I agree - it's most annoying. Maybe we're missing some option to turn it off.
Any luck fixing the Console noise? I would like to clean up some of it, for example text to speech creates hundreds of unnecessary info in the console. It is hard to see my own messages. For some reason the Watch simulator does not create as much noise as the iPhone sim.