I'm also a happy Kagi user.
There are only two reasons I still visit Google:
1. I'm based in the UK and often it shows me shops based
in the US high up within my search results.
2. Sometimes I specifically like to visit Google Shopping
to find the lowest prices online for an item I'm trying
to buy.
Once Kagi has improved these two areas I'll have no reason at all to ever visit Google (other than Google Maps or Google Translate).