The Flight deck air comes from a mixer unit which is supplied by two air conditioning packs (when available) and recirculated air from the cabin. It is temperature regulated (normally) by trim air supplied from hot air upstream of the air conditioning packs. It is fairly egalitarian in that the flight deck and the cabin receive their supplies from the same principle source. On an aircraft such as the Boeing 757 the flight deck conditioned air is normally a dedicated supply source tapped downstream from the left air conditioning pack, rather than recirculated air.
The Galleys and toilets are ventilated by cabin air drawn through an extraction fan that is vented in the vicinity of the outflow valve. That air is not recirculated assuming the fans are working, (and they normally run all of the time when electrical power is available.)
If you are sat in the vicinity of the toilets, then you might well be wafted with whatever floral aroma is prevalent when the cubicle door is opened, however there is no recirculation of that air from the extracted air back into the recirculation supply, other than what might be termed environmental escape.