Wood rots, recycled plastic doesn't. It's as simple as that...
How long does it take for wood too loose its looks when exposed to the elements continually? Not long.
It's perfectly possible these days to get the look and feel of wood but without the yearly round of maintenance.
All you have to do is replace your wooden garden bench with a synthetic wood equivalent.
The same tools that you'd normally use with wood can be used with Synthetic or plastic wood as well.