Well. I think this probably says more about local governments than it does about US Secret Service requirements. When an TFR is issued for presidential flights in the USA they are fairly straightforward and not generally too much of an issue. The ones I have operated around have an inner core with a requirement for any aircraft operating within it to be ( in short) an air carrier and an outer ring that forbids training flights and crop spraying etc but allows ifr flights and some vfr ones, with a squawk/under atc. Not particularly arduous.