i'll have to try that this summer, right now i can't go to the gym without it being packed thanks to my schedule.
You could try to do Giant sets with one or two barbells, plus a set of dumbells, harder to do but possible for some bodyparts. Works well for shoulders, by the time I do front raises, side laterals, wide grip upright rows, the weight i use for dumbbell presses is the same weight I used for the side laterals so you don't need lots of machines or lots of weights. I try and order the exercises so i can use one or two barbells or one or two sets of dumbells, plus it means you can't rest as much. Only tried this type of training out in the last few weeks and have been using this type of training on shoulders and biceps so far.