Gmail spam filtering also used to be revolutionary and an unsung hero. I haven’t put effort into finding out if other options have caught up with that (because of aforementioned tedium of changing email addressed)
Now that Pobox is owned by Fastmail, I rather suspect that Fastmail is going to have the same good spam filtering. Can't speak from experience, though, as I haven't actually used my new Fastmail account yet (it still forwards to Gmail, and so far I haven't switched. Momentum, again).