This Floridian has also seen a lack of birds at the feeder. Still plenty of water birds, lots of vultures (dead raccoons all over) and today I saw large flocks of what I think were Grackles in the shopping plaza that holds my precious Starbucks.
I hadn't even seen the squirrels trying to get at my feeder until one attempted it the other day. FYI, that Squirrel Buster really works! He ate the seeds on the ground which was fine. I had a Dell tech over the other day (broken power adapter, DO NOT get me started) and while we were sitting at the table in the breakfast nook, I looked out and saw a bird pecking under the bird feeder. I'm pretty sure it was a Dove, probably a Mourning Dove, but it was blending in with the ground and I was losing the light.
Since I'm still pretty new at birding, I wasn't sure if this was a normal slow time, like I get with my butterflies, so thanks for the input, fellow Floridians. I have seen a lot of Carolina Wrens hopping around, they just don't tend to use the feeder. They prefer to hide in the bougainvillea or Jatropha by the front door and get all freaked out when I open said door.