I’ve also had great experiences with the FCC Helpline, and I’m able to find my way through ULS, but it’s certainly not intuitive.
I’ve also had great experiences dealing with ATF (both as a 40 year former FFL and in meetings with leaders because of rocketry), BLM, IRS, and FAA. I know it’s popular to bash government agencies, but the vast majority of employees I’ve dealt with have been extremely conscientious and sincere in wanting to help.