Yeah, the triceps would be hard to develop. Unlike other muscle groups you have to either have a machine or get into a somewhat unnatural position in order to work them out well. I think you'll find that in any other activity from today until the day you die you won't find frequent occasion to perform the dipping motion outside of a workout (maybe if you find yourself on a collapsing bridge?).
Dips are a good general exercise but they don't isolate the triceps. Your shoulders and chest get involved in the motion as well. That's not the most efficient expenditure of energy.
Try these:
Get a dumbbell and hold it behind your head with both hands by the plate, both hands facing palm-up. Keep your elbows pointing up towards the ceiling, right about next to your temples. Extend your arms and raise the dumbbell up. Take special care not to get too aggressive or try too much weight at first, because you will hurt your elbow.
Another exercise involves the following, also with a dumbbell:
Bend over so your torso is parallel to the floor. Hold yourself up with one arm against a bench, chair or whatever. The other arm will hold the weight. Whichever arm is holding the weight, put the leg on that side forward to hold your balance and the other leg back. Your legs should be about a foot and a half apart and the forward leg slightly bent. Your elbow will be right at your side and your forearm and the weight will be pointed down.
Now, simply extend your arm, raising the weight up, bringing your whole arm parallel to your torso.
This one is a little rough but it gets the triceps well. Once again. take it easy at first because this one puts a little strain on your back and waist.
You don't want to neglect your triceps. I can't tell you how stupid it looks to see a guy with enormous biceps and puny triceps.
Well, I hope that helps. Good luck and let us know how it turns out for ya.