I get the reflex to deny permissions (and I also get the reflex to allow anything, in the interest of just getting the annoying pop-up to go away), but it's really tiresome that we have to expect people to avoid thinking even the least bit critically at every juncture.

If you're filling out a form with the express purpose of letting someone know specifically where something is... a request for location information is reasonable, duh. And I won't accept the "people are busy and don't have the time and energy to think this through" excuse. If you're taking the time to fill out this form, then yes, you have the time -- seconds, at most -- to think this through in this particular case.