It's a matter of personal preference and whether or not you want to be considerate of others. Period.
It
is easier to push and pull large plates when they're supported. If you're moving a lot of weight and feel more comfortable in the cage and there isn't anyone currently using it, then by all means jump in. If someone comes along and actually wants to squat and they see you really are moving relatively big weight, they're going to understand your need and simply ask how much longer you've got. There is NO NEED to feel like you're putting them out. In a gym you have to expect to wait for equipment once in awhile.
Now if I was wanting to squat and some joker is doing curls,
then I'm pissed off I have to wait but not if it appears the person
needs pins/cage.
Oh and btw, I'm never asking Lisa to move from the cage even if she is doing curls. She'd kick my ass and tell me about it. :p
