I would love to try a belt drive for use in winter. Lubricating and managing corrosion of a chain are a PIA. If it is true that cogs wear down inordinately fast that would definitely be a strike against them though.
Note: It's only because of the amount of salt that gets used on the roads here that I would consider a belt drive. If it's just moisture then I don't think it's as much of a problem. Things have improved for me with rust resistant chains and an IGH.