I started using aliasing last year too. To be fair, I lost myself on the way…
At first I was creating a new alias for each service (think facebook@, tinder@, youporn@, …). It worked great until I started forgetting the alias name (was is "tom-tom-sport", "tomtom-sport", "tomtomsport", …?). After that I started using categories (shop@, porn@, …), which effectively blurred the line even more.

Add to that all the "real life" emails that are not really tied to a service (insurance-car@ or electricity-bills@), and you get the cluster fuck that my email system now is:


Hopefully, I can still get an exhaustive list of my aliases by doing, and try to clean things up.

Over a year, none of the services I subscribed to leaked my address as I never received a spam on any of these aliases (which thus makes me totally reconsider the use of aliases as a spam protection…).
This however has the advantage of making it easy to sort emails, based on the To: address.

Regarding the spam themselves, they keep happening. All the "legitimate" spam (as in, offers from services like netflix) tend to include an unsubscribe link that I use whenever I receive such spam. Sometimes, they stop sending me offers :)
For "illegitimate" spam (grow your dick, ransoms for videos of me masturbating, …), spamassassin does a pretty good job at catching them, and move them to my "junk" folder. The fact I set up a spamtrap also helps blacklisting crawlers.

The thing I have the most difficulties with are "legitimate" emails addressed to the previous owner of the domain. As I use a catchall to redirect ALL mails to my main one, I regularly receive reminders that all beer orders must be passed before end of month, or stuff like that, sent to something like fjkldqjfmsd@domain.tld.
I tried to report it to the company (for which the website is ALL icelandic btw…), and never got an answer. I also receive offers from a supermarket in iceland, and I could not find the "unsubscribe" link in there.

So overall, I'd say using multiple aliases is not a great measure against spam, but can be a good organisation method for you if you can commit to it efficiently. Be aware that it requires a lot of discipline though.