For thirty years W. Hall Harris III has taught on the faculty of Dallas Theological Seminary in the New Testament Studies Department. Since 1995 he has served as Project Director and Managing Editor for the NET Bible at bible.org passionately steering this revolutionary Bible from inception to global impact. Dr. Harris has traveled extensively in Western Europe, especially in Germany and Italy. And as an ordained minister he has served over the years as pastor of single adults, elder, and adult Sunday school teacher.
This is an excellent and probably the only time that I've heard such a concise statement on commentaries and how/why to use them. I've been back and forth in using them for those reasons you state (being familiar with original langauges, not wanting to be influenced, etc). But overall try to keep a few digital commentaries on hand if and when I do find a passage harder to understand.
In light of what you write here, could your share your thoughts on using other reference documents such as lexicons, histories, etc. as parts of one's library of tools to understand and correctly apply the Bible's teachings and understand its concepts?