I have the service guys check my bushings every time I'm in for warranty work. This particular dealership is trigger-happy when it comes to "finding" things to work on or replace under warranty. For instance I was recently in for some repair to my 3rd row seats (the plastic piece that makes the seat belt receiver fold flat when seats are stowed). When I picked up the vehicle I was informed that they had also replaced my battery because it was testing "marginal".
My point is that if there was the slightest sign of wear on my bushings, I'm pretty sure they would have leapt at the chance to replace them.
On a sadder note, I will probably be departing the land of the warranty-endowed sometime this week: