Lucky you. I've also dealt with them for more than a decade and I've been harassed on more than one occasion (at the embassy and at the port of entry). One of my brothers was also harassed recently ... after two decades of traveling in and out of the US and never overstaying (never spending more than a few weeks per year, except when he had a J visa some years ago), they really grilled him at the embassy in his latest application for a tourist visa and he had to fight like a dog with every point he could think of and every document and paper he had on him. At the end of it they only gave him a 1-year visa instead of the 5- or 10-year visas that he got in the past.
Do you happen to be a white European or Canadian? I'm not.
Embassy is not USCIS. You had bad experience with other structure.