Are you sure that this is really because of Gen0 collections all by themselves, and not because the short cadence of collections leads to a lot of premature Gen1 promotions? I could imagine something like

   var a = InitGiantArray<Foo>();
   var b = InitGiantArray<Bar>();

could leave you with a lot of foo garbage in Gen1 or even Gen2, right were it really hurts. On the other hand I'd be surprised if something akin to

   do {
       Tuple.Create(new object(), new object());
   } while (true);

but with something useful thrown in would suffer much under GC pauses. Looks like I have to test it :I)