An update on this.
I've been doing the aliasing per year idea for the past 3 years so far.
I've noticed that I do not receive random spam emails anymore, however I receive spams from services I explicitly know I've subscribed to and I can't find a solution to that as even if I change the alias I want those services to contact me for other things.

So this more or less is all about promotional emails from shopping websites. Kind of annoying but you get over it.
Anybody has a similar story?