Hi 9ball:
I have a 1200GS and don't have any trouble at all moving off the seat. I actually find the seat easier to move around on than my K1200RS. With the RS, the seat slopes forward and tends to push you into the tank. Until I get into the curve where the centrifugal force stabilizes me, it requires pushing backward with your legs. With the GS, my legs are extended quite a bit more. Maybe that's the issue with you. After riding the GS, if I jump on the GS, I feel all scrunched up.
Robert