I have not had that experience. I admit when I first began reading Sproul's books and found he often quoted the WCF, it irritated me because I thought he was using it in place of the Bible. But he always backed up what he quoted with the Bible. I didn't just beleive Sproul either but checked.
The interesting thing, and this slides a bit off topic, but I am going to say it anyway.

The interesting thing is that in my checking I discovered that there was so much in the Bible, so many specific words that were being used over and over again (called, elect, chosen, grace, justified, atonement, etc.) that for years I had read often and slid right over them, if you know what I mean. The content found in the DoG are all over the scriptures. One of the most valuable things I learned from studying Reformed theology was
how to read the Bible.