If I pay for good seat tickets (not lawn seats) and someone's sitting in my assigned seat, is security good at enforcing tickets?

I moved somebody out of my seat personally but the staff will do it for you if you're willing to wait.

This is a great Pavilion, staff was friendly, helpful and show willingness to assist if needed. Great experience

Yes they will move them admittedly

Oh yes! They will move them immediately!

Yes, they are good about it

Yes