Yes. Great idea.

But... it took me about 2 years before I could climb any distance without feeling wasted.

But now I have mastered it, I find I can get into a good tempo and pace up a hill well.

Also, because you should change up a gear or even two when standing, I get up climbs much quicker. So, as Zen's post suggests, short climbs are when I stand. If its longer, I stay in the saddle

If you are new to standing when climbing though, be prepared to feel very puffed as soon as you sit down and for your quads to feel tired - that's because when you stand you are asking your body to do something different and it takes a few attempts (that is several rides) for your heart and legs to know how to respond to your request.

However, as luna points out, climbing seated is a more efficient use of your power and you will last much longer if you can get into a steady rythym and not let those climbing with you phase you if they are quicker.