Well, I use it to tell me the overall trend........i.e if the market is moving on top then overall I would call the market on an uptrend, it also depends where the MA is pointing up/down...besides that I think it does work as a very good support/resistace level if you are into position trading ? Have a look at a 1year daily chart and set the MA to 200 you'll get to see its importance.
How would you look at the market in the longer term ?
How would you look at the market in the longer term ?