Write an add-in for VS2010 that will do that for you. The standard versions won't hide those for you, collapsing is the best you can do without an add-in. But, if you write that add-in, you could win something on here for it.
Build a VS2010 Add-in and win a Zune
Found this post that shows how to write a macro to change what is shown then it's collapsed.
Collapse All XML Comments in VB .NET or C#
Of course, it's still collapsed, not hidden, but you could modify it to do what you're wanting.