Not necessarily. The safety pins on a squat rack (or power rack, not sure what the difference is) are handy if you're scared of dropping the weight on an OHP, or if you don't have anyone to spot you on the benchpress. If you move the rack's pins to the outside uprights, lower down near the floor, and put the bar there it makes it much easier to load/unload plates for the deadlift. For me, taking weights off of a bar on the floor is the absolute worst when you're exhausted after a heavy set.

But yes if you're using a squat rack for anything other than squatting, and the gym is busy, give others a turn. Or at least let them work in with you.