I also ended up creating a view to be able to see the DF constraints the same way I can see any other constraint via Information Schema views.
It doesn't have everything the official views has but it works pretty well for my needs...
CREATE VIEW [dbo].[SYS_V_DEFAULT_CONSTRAINTS] AS
SELECT c.name as constraint_name,t.name as table_name,cl.name as column_name
FROM
sysconstraints cn
INNER JOIN
sysobjects c on cn.constid = c.id
INNER JOIN
sysobjects t on cn.id = t.id
INNER JOIN
syscolumns cl on t.id = cl.id and cn.colid = cl.colid
WHERE c.xtype = 'D'