When you have a lane why not.

No lane, only if there's a good bit of room and it's backed up for 2 or 3 cycles. If I'm turning left with a box corner or right+u-turn, that's almost always a filter situation.

Often in the heavy traffic they might have passed while approaching the stop, and there was no rational reason for it. They aren't getting through any faster for it, traffic wouldn't be any more backed up if they stayed behind. I have a hard time feeling any sympathy for "making them pass" again when there was no reason to pass the first time, or even "again" some times, so in those situations I don't take that into account when deciding whether I want to filter up. If it bothers them that much to pass, and it doesn't change their trip speed either way, then don't pass me.