Reciving thousands of spam emails per user per day is ... not normal. If they weren't exxagerating then there must have some factors that saw them targeted specifically. I encoruage you to run your own mail server and publish your address on the web and see that the reality is pretty manageable without any filter.
Back when I was at university, 18 years ago, they told me their filters were blocking a thousand messages per day per student.
At my current workplace, scammers guessed my email address in the first month.
"Aliases" is a solution to neither of these situations.