The only place I've seen 5 spot tables have been at mid-stakes SD tables, because you can't deal RO6 with 6 people at the table. Doesn't make much of a difference to a CC because we shouldn't play with more than 3 hands in SD anyway. I've seen 9 spot tables on casino cruise ships. What a mess they are.
Then there are the 12-spot, 6-seat tables which are nice for solo backcounting because the counts move around so quickly.