Not saying anyone uses it or not. But people who do use it, crunch numbers and find a job can put out 1,300 dPS. How can you possibly know where you stand as a dPS if you have no clue what numbers you put out? Don't place yourself in "average" or above "average" if you don't have the tools to judge yourself.
Clearing content means little as a dPS unless you're clearing savage. My DPS on my monk is good enough I can carry atleast 1-2 other dPS through any content that isn't savage. So for all you know you're getting carried occasionally. You have no idea.
If you are doing really good chances are you got advice from people which can be sourced to the root that came from parsing. People who parse know the real numbers tell people the best rotation they found then that gets passed around. So if you are following best rotation, chances are parsing helped you without you knowing it.