I have used it all the time over a dozen years, both for site-specific email addresses and also for having lots of handy test email addresses in my personal app

I have used it all the time over a dozen years, both for site-specific email addresses and also for having lots of handy test email addresses in my personal app development. Often I just wish I had been more disciplined about using it even more for site-specific addresses, but fortunately more websites about friendly about unsubscribing these days.