Yep - all about prioritising.
If you cannot fit the gym in, then stop rationalising and don't go. I was to busy for the last 18 months working 100 odd hour weeks (don't ask) on a project. Everything got dumped for that period.
Now, I work 60-70 hr weeks, g/f, friends & gym. I'm doing my version of the layer system & it's working fine. It's in/out within 60-70 mins at most (provided you don't need 5 mins break each set) Do you have a spare hour ?
@Coyote - example of layer system here; http://tnation.T-Nation.com/free_online_forum/reactive_pump_training/voluminouss_reactive_pump_training
Effectively 1 lift a day for 4/5 days a week - then 2 exercises next 4-5.
I like it !