Around 100-120K miles, you will need to go through all the suspension bits. I swapped out struts, spring seats, bearing plates, ball joints, inner and outer tie rods and the sway bar links at 120K. I got a little "nervous" steering around 160K miles, which turned out to be my sub frame bushings. The IPD inserts are a half-assed band-aid. I'd skip them.
With the new bushings, the car had not only lost the nervousness on grooves and edges in the pavement, but it was also FAR more planted on rough roads and washboards. What previously felt a little rough and jarring was now new-car smooth.
You don't need to swap EVERYTHING but I have the same car. I bought it with 103K miles and a month later installed new struts and shocks (obviously with new spring seats).
Made a HUGE difference.
The rear suspension is relatively crude for a modern car and will always shock you a bit on bad bumps, but if it's stock and with 16" wheels, it should be very light.
17" wheels are always a bit rougher.
It also depends on your tires and tire PRESSURE. If you're running over 36 lbs. it WILL be rough!
Mine, before and after;