VERY, VERY, clear. Before you even reach the line there is a CM that will ask you if you want the spinning or non-spinning side and will give you either an orange or green card and point you towards the correct, well labeled, line. Each line has its own wait time and if you want the orange side just get into the longer line.
Green side has a lot shorter line normally. My DSIL and I was able to ride it 3 or 4 times before the rest of the family got to ride the orange side even once. I LOVE the green side and would love to ride the orange but can't due to medical issues. The ONLY difference in the two is that the green side doesn't spin so you only experience 1 G on lift off instead of the multiple Gs of the orange side. The green side is still lots of fun.
Why would it upset you? It is only a ride and the mild side is still very well done.