Well, the really busy airports do have protected airspace around it, the extent if that airspace is re-evaluated each year based on traffic numbers, airprox reports and airspace needs by other users. Just for perspective, there are around seven times more glider planes in germany than commercial jets, around four times more glider pilots than those flying those jets. That is a very big lobby group, not to mention substantial numbers of ultralight (not governed by EASA) and “normal” other airspace users. And of course the military wants to play as well and low level is done purely VFR (don’t fly between 1000’ to 1500’, thats the playground of those 450 kts VFR guys during the week and during office hours).
The high viz vest thing seems to be more of a british thing, not really much of an issue at most german airports.