For sways and endlinks you need the suspension loaded (i.e. tires on the ground or ramps). You could do an exhaust with ramps, you just might feel a bit cramped. I have ramps for now, but will also be adding a floor jack and stands, both serve their purpose.
I've done my FSB and shifter bushings on ramps, and shortly my transmission mount and cross member bushings. The biggest issue for me is forgetting a tool and having to wiggle out from under the car, but otherwise it's fine.