Speaking of sharing: I, a fast cyclist, often travel down 7th Avenue, a nice wide street with bike lanes on both sides. Probably the best street to bike on in the city. On nice days these bike lanes are often populated by walkers, joggers, and stroller moms walking/running two abreast.
Even though the bike lanes have a big bike symbol in them - which I guess imply they are MY lanes built for me and me alone, do I yell and scream and b*tch about them being in MY bike lane? (Me Me Me Me!!)
Of course not. I'm not a jogger but I know asphalt is easier to jog on, and the stroller moms and joggers don't want to navigate old neighborhood sidewalks with their curbs and uprooted sections of concrete. Thus a nice wide boulevard is easier for them.
They are slower than me, but I can easily pass them and share space with them. I stay alert and aware, and its no different than me sharing a street with pedestrians versus cars sharing a street with bikes.
Its really not that complicated.