Many seem to be getting smaller and smaller. This is not always a bad thing.
Requirements over the years have changed dramatically.
Smaller sites often mean you still get a modest Single or Double story home to meet your needs.
Often the size of these sites mean you are not in direct competition with developers.
The price points of smaller sites and the advantages of less maintenance gives you the time and money to focus on other interests, whilst still providing for your family or a foothold into the residential market.