Mapping the landuse items such as farmland and orchards have never been easier since the changes to these keys in OSM. However, it may still be a boring job if you are not patient enough to draw all agricultural zones which are often large and covering several other features like ponds (landuse = basin), house (landuse=residential), roads and meadows for grazing (landuse=meadow). These smaller areas are shown in different colours : orange, blue, gray, white and light green respectively. So, it is not a boring job at all when all of these are uploaded and rendered on the map.

Have a look at this farmland Alloway country south of Bundaberg City, QLD, Australia, which I have mapped in recent 3 days. The hardest challenge has been tagging forests - either natural=wood and landuse=forest, however, i prefer forest for protected areas, while wood are smaller, or riverside woodlands.

Alloway, QLD http://www.openstreetmap.org/#map=13/-24.9472/152.3864

Note: not all of the updates are loaded in this view. Zoom in to see more.