With an 'Empty Data View' by the 'Short & group' you can use 'Edit sort expression' for exsample 'count(@Title)'
chech the box 'Show group header' and you have in the view the count.
refer this post for a work around to get the current user in SPD:
Getting the Current User Name or ID in SharePoint using SharePoint Designer
You can specify Totals even on View settings page:
Bond... Brooke Bond!
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