Has this been something you have found in practice? Or just theory/fear you've developed? I would think tools like sqlmap are helpful in building that initial recon/inventory of items to explore. You should still be doing the due diligence of manual exploration. I suppose if one were to get lazy and stop doing the manual exploration, and just let the mapper tell them where to look, it is most definitely true. However, people can get lazy without automated tools, and fall into the same trap.