imo, learning the relevant city map(s) is the most useful thing travelers can do anywhere (not just china).
as for touts, while many of them are crooked, i use them often now because i don't like standing in line and have had very good experiences. it's just important to deal with them in a controlling manner (i.e. clarify all relevant details up front and don't accept additional riders). and, for getting around town, 黑车 are often preferable to metered taxis (nicer cars, can pay by the hour, etc)