I'd be real happy if an Indigo Bunting stopped by my feeders :-) but yes, I am experiencing the same here, even the goldfinches and siskins seem to be coming only very occasionally for a few seeds, altho they are singing away up in the trees.
Grackles +babies, cowbirds + babies, sparrows, starlings, doves seem to be the majority, the jays and cardinals come irregularily and once in a while the RRBW shows up. Haven't seen a woodpecker or nuthatch in a couple of weeks and even the hummers are only occasional. I guess they are finding more natural food sources, which is good, and using my offerings as a suppliment when needed.
Joann