rabbiofberlin: Though you can’t really functionally get to one from the other except by car, and the Zishe’s parking lot is a war zone. However, as it’s a war zone with the best vanilla rugalech you will ever taste (made by chassidim, at that), it is pretty much worth it even if you come out with a few scars :).
There are, though, bigger or smaller concentrations of chassidim in different outer areas. If the post office calls it Monsey (except the Concord area) then you can expect to find more chassidim. Spring Valley, either yeshivish (if New Hempstead) or chassidish (not the greatest neighborhood anyway, however). Wesley Hills, Pomona, Forshay- probably not. But even in these areas, unless you only shop in WK, which is impossible as the other stores are MUCH better, you will bump into chassidim. (I assume yosef isn’t interested in Airmont as all the nearby shopping is in the 306/59 area.)
Also, you mentioned something like a shteibel on every corner. I assume that you realize that Monsey is stretched out. You need a car, you may never see your neighbor two doors down, etc. You can pretty much pick where to go.