In reply to Ian Bentley:
It's simply another form of climbing. It can still be physically demanding, and as it gets more difficult you need to understand better what your gear's capable of, what it will and will not do. It can be very scary, etc, etc.
I'm a believer that because you body weight all of your placements when aiding, your use of gear in trad routes improves - you have a much better sense of what is, and isn't, marginal, what will and won't hold.
Lots of folks go years without that knowledge, they give their gear a tug, don't fall off, belays are never weighted etc.
Best way in the world to understand your gear.
Oh, and whilst it can be hard graft, it's also a lot of fun!
Steve