I had Abbott butterfly bushes put on my last car at 120k miles, they did wonders for the precision of the steering. My wife commented on the feel, even though I hadn't told her they had been done.
Other bushes were replaced around the same time, eg: the link rod from the anti roll bar to the lower wishbone, with little noticeable difference in either feel or harshness. Then again there wasn't really anything wrong with the originals, but I wanted to see what would happen...
Nick. (Minus a car until I pick up the Aero tonight)
Because I had new rear AR bar bushes all round at the same time (240k miles) as I had the springs and dampers replaced it's had to be sure as to what made the most difference. But a massive difference was made, and I'd say do it, you won't regret it.