I watch them speed by, way too close most times
If you think that people who already ignore laws like those on speeds and safe passing distances are not simply going to also ignore this new law, then you are illogical and likely to be disappointed. The main effect of this law will be to further reduce the number of law-abiding e-bike riders and put more cars on the roads.
Don't let your hatred for some e-bike riders make you agree with some truly awful short-sighted laws.
Then the fines probably should be higher and each offence should come with a short but progressively longer suspension of their driving licence.
I've seen a few slaps, mainly in Norwich, England, where of course gun ownership is tightly regulated by law and road rage killers are national news and remembered for a long time (Kenny Noye, for example). I've not yet seen anyone walk or slide over a hood.