I only say that they're not nice because they dive bomb me whenever I get too close to their favorite flowers! They don't bother me filling the feeders in the back but will in the front, they don't come into the covered part of the deck often, only when they're chasing each other. The females aren't nearly as aggressive, I've seen several of them sitting and drinking from the same feeder, the guys aren't into sharing, though.
I don't think we get as many as you must, I've had feeders empty after several days but never had to refill one twice in a day! I normally only put 2-3 cups of mix in each feeder as I hate to waste it. I normally put out additional feeders as I see more birds, more feeders not filled as much seems to work well. Oh, and I can't clean the windows in the back of my house during hummingbird season--the first year I had to many tragedies where they ran into the windows and died. It's sickening when you hear a thunk, go to the window and see one of them lying there....I have dusty windows now all summer but haven't had one die since I put off cleaning until the fall.