I've been using a similar system, only that I additionally append a random 5 digit number, so that if e.g. hilton-68425@domain.org gets leaked, that doesn't automatically make hyatt-95813@domain.org easy to guess. Though it does sound like something that might be possible to brute force.

Also, they feed into different subfolders of the same main address.

It definitely has caused some issues, but nothing that would make me regret choosing this system. Obviously the email gets stored in the password manager. And even if not, I just look at the existing emails and check their destination address.

Honestly, the most annoying part is the setup of new addresses. I might look into a way to automate that.

Although it is true that I have not caught a single company giving the email away, but it still helps me keep the inbox organized.