I used to have a primary email address as well (which occurs in several HIBP breaches). I never gave it up, I still have it to this day for sending personal mail. However, I started using service-specific email addresses (e.g. hackernews@example.org) at some point, gradually transitioning every account I registered somewhere to this new scheme. They all end up in the same inbox, together with the emails from the original address. If one of them ends up in a breach, I block delivery to that service-specific address and add a new one.
I do too. Though it does get awkward when dealing with a human related to that site. E.g. a small time hotel phoning about a booking or a local events organiser, they all seem weirded out that I have their name in my email address...
:)
I often rely on Fastmail's email masking these days instead, which at least reduces that human interaction awkwardness.
