I used to smoke and knew where the smoking spots were located, but the last time we went, at the MK, they had changed or taken away spots, like you said. The smoking spot by the entrance to the Adventureland was so busy and so dirty with overflowing ashtrays, it was disgusting. I don't enjoy having to smell cigarette smoke anymore, but they need to give smokers the space to smoke.
There are always people who do not care about anyone else. I, myself, have seen smokers walking along Main Street. That is just plain rude. If you cannot find a spot, even though they are marked on the park maps, then find an out of the way spot so not to intrude on other guests