I like courses that post them for a couple of reasons. One reason is I have a putter with changeable weights. While not a big deal, I would rather not have to go back to the car to change the weights when and if I find out the greens are particularly slow or fast. I normally have the mid-range weights in place on the putter (an Edel for those who are wondering).
For Aimpointers, I still go through the process to validate what they have posted. My first few putts on the green are simply to get a feel for speed from about 20 feet. then I do the determining slope routine. If I nail it the first time, I am good and away I go to work on a few straight putts for feel and confidence. So,,While not needed, I do like having the number posted..
(A lot of time folks do not believe me when I tell them what I have come up with even though my reads are right on.. they are always guessing they are a lot faster...just like they think their 240 yd drives are right at 300 yds.. )