I think they're very useful on roads that tend to get congested. Though where there's no ASL, I will find a space, any space, near the front ANYWAY.
I will not be as arrogant as to "skip the queue" when it's obvious any time I save will be outweighed by delay caused to following drivers. Everyone's journey is equally important. We all complain about "MGIF" from motorists, flying to the front and not saving much time whilst inconveniencing us. That said, this doesn't often happen in stop-start traffic as it doesn't really matter whether 20 or only 3 cars made it from the front of one queue to the back of the next.
One benefit of an ASL approach is that traffic tends to stay "in its lane", this sometimes means there is an acceptable gap through which to filter without needing to move between nearside/middle/offside constantly as traffic has stopped kind of sort of a little bit in its lane but not really.
Unfortunately ASLs seem to give inexperienced cyclists a false sense of security, the paint seems to make decisions for them. Newer cyclists seem to do dangerous things in ASLs that would be clearly MENTAL if the ASL wasn't there.
On that basis alone I think we should give up on the crappy ASLs we've all seen. Either put something good in that isn't encouraging cyclist risk taking or don't put anything in at all.
ASLs without approaches could be beneficial on congested routes to that effect?
My council seem to have taken the opposite line though