I agree - There is no need to do 'dull' work. If it takes up more than a small portion of your day, then change what you do.
If it's a job you have, then talk to your boss about what projects you would be excited to do, and see if you could work together to change the dull/exciting mix. Offer to work extra on the exciting/challenging project to prove your capabilities if that's a necessary step.
We had a programmer who was often on 'dull' assignments worked nights on a really big problem our company was having - our new product was sluggish, and needed some serious redesign. He spent a month working on a proof of concept on his own time, and then presented it to his boss, and then the programming team.
Now he's working on future architectures and pretty high level, fun and interesting stuff.
It's dull enough to post for help on a newsgroup. Do something about it. Change your trajectory.