There is an option in the settings that basically says “analyse and beatgrid when adding to collection” (that’s not exactly what it says but it’s close to that). Check that off, then click the first song in your itunes library in the traktor browser, scroll to the bottom. Hold shift, click the last song so every song is selected. Then right click and hit “add to collection”. This will analyse and add every track to the traktor collection. Will take awhile depending on the amount of songs. Don’t interrupt it or stop it.
The way I organize is I open up traktor. Go down to the itunes browser and then go to the recently added playlist. There is an icon that tells me if it’s been added to my collection or not. I add those not in the collection so they get grided/bpm detected. I then have quickslot playlists set up for MIK 1-12. I add the songs to the appropriate playlist and I’m done. Everything generally organized in about a minute.