DC legalized Idaho stops. Nothing feels at all different. Almost all bicyclists are so much better about clearing intersections than anything else moving that nothing else makes any sense. There's effectively zero cost, except making drivers green with envy/making them lose their cool.
I do signal. It's pretty rare for bicyclists, but it's also 50/50 at best for cars, and they near universally operate with much less safety margin/more risk than any bicyclist (ironically the extra scared/slow/cautious drivers are often those that I see create the worst scares, damning all by their lack of clear confidemt cool execution).
It feels like only recently (in the US at least) are some cities & states trying to figure out what rules make sense for bicyclists. It's easy to just say, you're like a car, follow all those rules, but it doesn't really make sense. Bicyclists just don't take up enough space & are so much more nimble, so much more free, and often usage of those capabilities can speed up cities where cars, bikes, and people move around.