Not necessarily easier...
Let me start this off by saying that I agree that I don't think access should be used for business critical applications...
However, as a lot of businesses already have MS Office Pro, they already have a copy of Access, so installing it is not another financial expense (as they already have the licence)... hence, for the less tech savy people within the business that are already very familiar with the look and feel of other Office applications, installing and using Access to perform a task, is far easier to them than to try and download and setup MySQL etc. Plus I'd be willing to wager that most non-it people within any business would more than likely not even have heard of MySQL and PostgreSQL, let alone know how to get it up and running!!
My 2 cents worth...
