What kind of progress have we made since 2005 in preventing (not treating) SQL injection? I remember reading a book about PHP security that year where escaping strings and bound parameters were mentioned.
You can usually grep or even use static code analysis to help find where your existing code is using "tainted" data to construct a query.
Also, if you use an ORM, you'll generally be working at a high enough level where SQL injection is impossible (unless there's a bug or design flaw in the ORM); since you won't be directly dealing with text queries.