Europe
I'm currently in Prague LKPR on a European trip, most larger TMA's in Europe are adopting a Mode S requirement to be able to fly VFR in their airspace. That's why I find it useful as it gives me the 'go-anywhere' ability without having to trawl information about specific aerodromes requirement for fly in VFR. If you're just flying in the UK then it doesn't matter too much but it doesn't mean that the UK won't start implementing the Mode S requirement in the future.