When I was in my 20's I tried various SSRIs - at least three, possibly four different ones - and my pattern was always the same, which was to take them for six months, get frustrated because they didn't do anything but make my hands shake, etc., then flush them down the toilet and quit cold turkey with no ill effects. Same thing with Ritalin. I was taking it for a few years because it (shockingly!) made me a more prolific computer programmer, then my doctor moved to California and I never got a new prescription. No withdrawal whatsoever that I noticed.
My personal, subjective, anecdote-based take on this is the stories of withdrawal are as overblown as the stories of effectiveness for a lot of these.