For my personal email, I don't organize anything. It all goes into the primary inbox and I just snooze messages over and over until I feel like dealing with it, eventually. After 2 or 3 snoozes I'll usually either finish it or archive and forget about it. The really important things get starred... and then snoozed anyway.
Once every few weeks, I'll mass archive everything left over in the inbox (that's not starred or snoozed). Meaning they just disappear into the cloud and never get dealt with. I figure if it's important enough they'll email me again anyway...
This means that by the end of an average day, I have between 0 and 5 massages left in the inbox. It keeps the daily responsibilities manageable.
Has worked well for the last decade or so. Good enough for me.