I have four hives, four queen excluders, and have never used the excluders once. I have not yet had the problem of the queen laying in the supers until I rearranged the hive configuration
Now Im just working on getting the queen out of the one super. Anyway, another beek here has excluders on all his hives,32 hives, and I can see the difference between my supers and his. He has a lot less comb in his supers.