Personally I have noticed some weird things lately. Perhaps I'm just getting deviated my fair share amount. But there have been a couple putts recently where I played for dings which I don't do often at all for putts and the line of the putt noticeably started off right away on the wrong line. This is with the highest level sabertooth putter and with a relatively straight putt.
I would agree with duffputt with your scenario though, that seems spot on. You just have to know how some courses/holes react. 30/40 rough at bpb for example sometimes plays to 5 extra yards and you virtually retain all your spin with wedges. You go to another course that same type of 30/40 plays 8 yards and you have to play roll out 2/3 yards