My father will disown me when he reads this post. I am now an owner of a leaf blower. He hates leaf blowers because of the noise they make. I bought mine used and it's electric. It's not as loud as the gas powered models, but it's still pretty loud.
The reason I bought it was because our roof had a leak. The roof company employee said it was because of pine needle build up on the shallow slope of the roof. He recommended that I use a leaf blower to clean off the roof once or twice a year. He also recommended that I use moss killer on the roof to keep moss from growing.
It takes longer than using a broom, but you can tell that it's not so hard on the shingles. It's good practice to keep one's roof free of debris as it helps keep the down spouts unclogged.
Later that week the roof company owner had the employee come back out a make some adjustments where the leak occurred. He didn't think the leak was solely due to pine needle build up. Okay by me.