You can build some awesome pecs and tris doing dips, bench dips, and all sorts of push-up variations. Pull-ups and chin-ups will nail your lats quite well, and you can rig up a way to do rows as well. You can do good mornings with no weight for your lower back. You don't really need any weight to work your abs, so they are no problem. Legs are a bit more trouble to work intensely, but sissy squats(NOT for sissies), one-leg squats, slow, concentrated calf raises, plie squats, and just doing a qhole shitload of no-weight squats (once I did 500) will get em sore.
The exercises in that article are probably pretty good as well. Oh, and if you have a fear of committment you might want to get over it, because the one thing needed for any workout activity to be effective is consistency.