Mp859, the comment I made above would only be reserved for times when there is only one piece of equipment for a specific exercise. For example, the gym I go to only has one squat rack. It sucks, but I've asked people before if I could work in, and have also allowed others to work in with me. But I agree, if there's more than one piece of equipment then it would only make sense to use another one.

I guess either way it isn't ideal, but it's just things that you have to put up with sometimes.