My inclination is to set up maproulette with an overpass query like this one: https://overpass-turbo.eu/s/1Rpe and use it to go through and clean up some of the mistagged things. I'd like to clarify a bit of the standard before than, my inclination is:
- off street, shared paths should be mapped separately
- cycletracks _can_ be separate, but can be tags. There's some fuzzyness here, where e.g. parts of Beacon St in Somerville have a cycle track with a sloped curb, so there is no hard separation
- buffered bike lanes must have tags indicating buffer. I believe this necessitates not mapping separate, as I don't believe there's a standard for that ( I also don't think these should be separate per the OSM wiki definition of "on street")
- non buffered bike lanes should never be separate

This would add more information in  terms of what is/is not buffered, reduce the number of places where there appears to be an off street path that doesn't exist, and associate more cycleway tagging with already named street ways