On the B744 the galley is at Door 4 and was kept curtained off the whole time they weren't serving.
On LHR-SIN-SYD and back most of the flight is during the night, with many passengers trying to sleep (and often succeeding). The cabins are therefore kept dark most of the time and the curtains, even between different bits of WT, are kept shut to contain the light from the galleys.
I must admit that on a recent trip to Sydney the drinks rounds were not very obvious, but I find the WT+ seats fairly comfortable and slept a lot of the time.
On these and other flights I have found the cabin crew generally friendly and helpful on the rare ocasions that I have ventured through the curtains.