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I've edited my previous text to be more clear :)
Thanks for your critique, everyone has a different experience and perspective innit?
I find cyclists are much more open and aware in sharing the road.The OSM maps can help in learning road surface and condition. OSM maps carry an incredible level of detail but are not perfect, yet. Anyone can make an account at https://www.openstreetmap.org and inform if a road surface was not as indicated. It is a great community helping folks like us who need this type of data. On the phone one can use OSMAND and Orux to view the OSM data.
Well. *obligatory remark warning* All of those people you mention there are traffic (as are you). Don't allow users of motor vehicles to claim they're the only traffic that is. Needless to say, often you're only a guest on paths like this if you're on a bike, and shouldn't presume that they have any duty to make way for you. I'm not entirely sure if you're being ironic there.
Also, when going 'full gas' on paths like the ones I assume you mean, whose quality is at best variable and at worst sometimes quite hazardous, varying between any kind of tarmac quality (very good to abysmal), gravel of all kinds, churned-up mud, and the like, always be aware that bad surfaces are a major cause of crashes and catch people being inattentive all the time. The outcome of such crashes can be very bad, as people can crash very awkwardly when they've let their guard down.
As a general rule, obviously, you can't go as fast on a sidepath or other off-road path as you could on a well-built road.