Strictly speaking for personal device speed, the only need I see for 5G would be for internet use. Even with streaming video, etc., I don't see where the extra speed will make a marked difference for a phone...there's not that much video data needed like on a large screen TV that uses streaming video. Now, if you hook up your home internet to it...as in a hotspot...maybe that will make a difference.
Most likely the big deal is speed in congested areas. So my perception is that it benefits phone companies and densely packed users. Otherwise not of much use to me....unless I am missimg something relevant to me.