I agree with jaxs - the top link (screw in/out) does help to get things lined up. I've got a quick hitch and even with that, top link adjustments are usually necessary to get things lined up to mount an attachment. Since I've got a rear hydraulic remote I'll probably eventually add a hydraulic top link, to make it easier to line things up without getting off the seat. As I don't do much fancy grading, I'd probably start with the hydraulic top link - if I ever need a hyd. side link I could add that later with another rear remote.
With a walker, you might want to consider both the quick attach and a hydraulic top link - might save you a lot of getting on/off the tractor.
On a related note, I've got a pretty heavy rear blade. Given the weight, I've always removed the 3PH quick attach and pinned the blade directly to the 3PH toplink & arms. Am curious if others are using their rear blades with the quick attach and if there are any problems.