The USMC were always more focussed on air combat than the RAF and so perhaps practiced using the nozzles a bit more but the old “quick viff and he’ll fly right by” is really a non starter. The fighter would just use the vertical and the harrier would now be low and slow with nowhere to go. It was considered as a last ditch option if someone was closing for guns as, by that stage, you’re pretty much out of options anyway. Seem to remember that RAF release to service only allowed viffing in clean jets and you tended to only fly those on dedicated air combat practice phases so the chances of using the nozzles in any sort of real world combat are very very small indeed.