My take on the turkey pan is that using it is personal preference.
Ford put one underneath the OEM cast iron intake to prevent oil from getting on the bottom of the intake where it is heated by the cross over that runs underneath the plenum. Since aluminum intakes transfer heat at a different rate than cast iron ones, leaving the turkey pan off probably doesn't make much difference other than a big stain on the bottom of the intake.
If you are using an aluminum intake without an exhaust cross over then you probably have even less to worry about.
However, there probably is an argument that says a turkey pan (under an aluminum intake) would prevent hot oil from transferring heat into the intake. The same logic for going to an 'air gap' style intake...
So, long version is it's up to you!