Never if I'm using a meterless camera (I don't own a hand held meter). Back when I was using a DSLR I shot it in A priority, though.
In general and for the work i do, I find metering to be superfluous. I used to meter relentlessly and I was petrified of not getting readings. When I first began using MF, i was faced with a meterless camera and I decided to let go of my fears and start estimating. It took some practice but after a while it became second nature, even indoors, in low light, at dusk, whenever. Everyone should give it a shot, it's really not that daunting and most importantly it's liberating!